diff --git a/.idea/.idea.linuxdistrosbuttheyarebreedable/.idea/workspace.xml b/.idea/.idea.linuxdistrosbuttheyarebreedable/.idea/workspace.xml
index 61508cc..5635010 100644
--- a/.idea/.idea.linuxdistrosbuttheyarebreedable/.idea/workspace.xml
+++ b/.idea/.idea.linuxdistrosbuttheyarebreedable/.idea/workspace.xml
@@ -11,13 +11,29 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="4222a6b8-add3-4f43-9c42-fd6bb5a76169" name="Changes" comment="">
+      <change afterPath="$PROJECT_DIR$/Assets/Resources/TerminalScrollbars.uss" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/Assets/Scripts/Meta/DistroVersionCatalog.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/Assets/Scripts/Meta/GachaTuning.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/Assets/Scripts/Meta/PullResolver.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/Assets/Scripts/Meta/VersionUpgrader.cs" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/.idea.linuxdistrosbuttheyarebreedable/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/.idea.linuxdistrosbuttheyarebreedable/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Combat/CombatTuning.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Combat/CombatTuning.cs" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Meta/GachaService.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Meta/GachaService.cs" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Run/RunManager.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Run/RunManager.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Resources/CombatScene.uss" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Resources/CombatScene.uss" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Combat/CardEffects.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Combat/CardEffects.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Combat/CombatManager.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Combat/CombatManager.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Combat/CombatantState.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Combat/CombatantState.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Combat/DamagePipeline.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Combat/DamagePipeline.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Combat/DeckController.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Combat/DeckController.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Meta/PlayerCollection.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Meta/PlayerCollection.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Meta/SaveService.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Meta/SaveService.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Run/RunConfig.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Run/RunConfig.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/Run/RunContext.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/Run/RunContext.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/Scripts/UI/CollectionScreenController.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/UI/CollectionScreenController.cs" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/Assets/Scripts/UI/CombatSceneController.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/UI/CombatSceneController.cs" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/Assets/Scripts/UI/GachaScreenController.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/UI/GachaScreenController.cs" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/Assets/Scripts/UI/MainMenuController.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/Scripts/UI/MainMenuController.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/UI/CollectionScreen.uxml" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/UI/CollectionScreen.uxml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/UI/MainMenu.uss" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/UI/MainMenu.uss" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Assets/UI/MainMenu.uxml" beforeDir="false" afterPath="$PROJECT_DIR$/Assets/UI/MainMenu.uxml" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -52,9 +68,13 @@
     <setting file="file://$PROJECT_DIR$/Assets/Data/Cards/Fedora/CargoBuildRelease.asset" root0="FORCE_HIGHLIGHTING" />
     <setting file="file://$PROJECT_DIR$/Assets/Data/Cards/Languages/Python/PyPrint.asset" root0="FORCE_HIGHLIGHTING" />
     <setting file="file://$PROJECT_DIR$/Assets/Data/Cards/Ubuntu/AskUbuntu.asset" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/Assets/Data/Distros/DistroDatabase.asset" root0="FORCE_HIGHLIGHTING" />
     <setting file="file://$PROJECT_DIR$/Assets/Data/Distros/Fedora.asset" root0="FORCE_HIGHLIGHTING" />
     <setting file="file://$PROJECT_DIR$/Assets/Data/Distros/Mint.asset" root0="FORCE_HIGHLIGHTING" />
     <setting file="file://$PROJECT_DIR$/Assets/Data/Distros/Ubuntu.asset" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/Assets/Data/Passives/AptUpdate.asset" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/Assets/Data/Passives/BleedingEdge.asset" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/Assets/Data/Passives/ItJustWorks.asset" root0="FORCE_HIGHLIGHTING" />
     <setting file="file://$PROJECT_DIR$/Assets/Scripts/Data/LanguageDeckDatabase.cs" root0="FORCE_HIGHLIGHTING" />
     <setting file="file://$PROJECT_DIR$/Assets/Scripts/UI.meta" root0="FORCE_HIGHLIGHTING" />
     <setting file="file://$PROJECT_DIR$/Assets/UI/MainMenuPanelSettings.asset" root0="FORCE_HIGHLIGHTING" />
@@ -70,23 +90,23 @@
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   <component name="NextEditCompletionFeaturesState">
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@@ -94,37 +114,37 @@
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@@ -213,7 +233,7 @@
       <workItem from="1783330590375" duration="18451000" />
       <workItem from="1783371975450" duration="26000" />
       <workItem from="1783372397891" duration="989000" />
-      <workItem from="1783410502976" duration="5821000" />
+      <workItem from="1783410502976" duration="10247000" />
     </task>
     <task id="LOCAL-00001" summary="implement main screen">
       <option name="closed" value="true" />
@@ -335,7 +355,15 @@
       <option name="project" value="LOCAL" />
       <updated>1783417593908</updated>
     </task>
-    <option name="localTasksCounter" value="16" />
+    <task id="LOCAL-00016" summary="implement scaling rewards per wave completed in combat mode">
+      <option name="closed" value="true" />
+      <created>1783421764662</created>
+      <option name="number" value="00016" />
+      <option name="presentableId" value="LOCAL-00016" />
+      <option name="project" value="LOCAL" />
+      <updated>1783421764662</updated>
+    </task>
+    <option name="localTasksCounter" value="17" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -365,7 +393,8 @@
     <MESSAGE value="finish implementing main" />
     <MESSAGE value="fix some stuff" />
     <MESSAGE value="Implement too many changes to list" />
-    <option name="LAST_COMMIT_MESSAGE" value="Implement too many changes to list" />
+    <MESSAGE value="implement scaling rewards per wave completed in combat mode" />
+    <option name="LAST_COMMIT_MESSAGE" value="implement scaling rewards per wave completed in combat mode" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
diff --git a/Assets/Resources/CombatScene.uss b/Assets/Resources/CombatScene.uss
index 603971d..9fd116f 100644
--- a/Assets/Resources/CombatScene.uss
+++ b/Assets/Resources/CombatScene.uss
@@ -32,6 +32,10 @@
     --kp-lang-go: #6de6ff;
     --kp-lang-ruby: #ff5f7d;
     --kp-lang-php: #9aa2ff;
+    --kp-primary: var(--kp-text);
+    --kp-scroll-track: var(--kp-panel);
+    --kp-scroll-thumb: var(--kp-text-dim);
+    --kp-scroll-thumb-hover: var(--kp-border-strong);
 }
 
 .combat-root {
@@ -186,6 +190,8 @@
 .meter-fill {
     height: 100%;
     background-color: var(--kp-text);
+    transition-property: width, background-color;
+    transition-duration: 220ms;
 }
 
 .meter-fill-warning {
@@ -951,3 +957,200 @@
     opacity: 0.72;
     border-color: var(--kp-text-dim);
 }
+
+.feedback-layer {
+    position: absolute;
+    left: 0;
+    right: 0;
+    top: 0;
+    bottom: 0;
+}
+
+.damage-vignette {
+    position: absolute;
+    left: 0;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    opacity: 0;
+    border-left-width: 10px;
+    border-right-width: 10px;
+    border-top-width: 10px;
+    border-bottom-width: 10px;
+    border-color: var(--kp-danger);
+    transition-property: opacity;
+    transition-duration: 120ms;
+}
+
+.damage-vignette-on {
+    opacity: 0.62;
+}
+
+.float-number {
+    position: absolute;
+    min-width: 60px;
+    height: 24px;
+    -unity-text-align: middle-center;
+    -unity-font-style: bold;
+    font-size: 18px;
+    opacity: 1;
+    color: var(--kp-warning);
+    transition-property: top, opacity;
+    transition-duration: 420ms;
+}
+
+.float-damage {
+    color: var(--kp-warning);
+}
+
+.float-heal {
+    color: var(--kp-beneficial);
+}
+
+.float-status {
+    color: var(--kp-danger);
+}
+
+.float-muted {
+    color: var(--kp-text-dim);
+}
+
+.float-kill {
+    color: var(--kp-danger);
+}
+
+.float-large {
+    font-size: 23px;
+}
+
+.float-static {
+    transition-duration: 0ms;
+}
+
+.feedback-card-ghost {
+    opacity: 0.9;
+    transition-property: left, top, opacity;
+    transition-duration: 260ms;
+}
+
+.feedback-card-route {
+    border-color: var(--kp-accent);
+}
+
+.feedback-card-strike {
+    border-color: var(--kp-warning);
+}
+
+.feedback-card-discard {
+    border-color: var(--kp-text-dim);
+}
+
+.feedback-card-instant {
+    opacity: 0.72;
+    transition-duration: 0ms;
+}
+
+.feedback-hit {
+    background-color: var(--kp-action-hover);
+    border-color: var(--kp-warning);
+    scale: 1.025 0.98;
+    transition-property: scale, background-color, border-color;
+    transition-duration: 90ms;
+}
+
+.feedback-block {
+    border-color: var(--kp-beneficial);
+    transition-property: border-color;
+    transition-duration: 90ms;
+}
+
+.feedback-status {
+    border-color: var(--kp-danger);
+}
+
+.feedback-boost {
+    border-color: var(--kp-beneficial);
+}
+
+.feedback-killed {
+    opacity: 0.5;
+    scale: 0.95 0.95;
+    border-color: var(--kp-danger);
+    transition-property: opacity, scale, border-color;
+    transition-duration: 180ms;
+}
+
+.death-ghost {
+    background-color: var(--kp-panel-raised);
+    border-left-width: 2px;
+    border-right-width: 1px;
+    border-top-width: 1px;
+    border-bottom-width: 1px;
+    border-color: var(--kp-danger);
+    opacity: 0.72;
+    transition-property: opacity, scale;
+    transition-duration: 300ms;
+}
+
+.enemy-acting {
+    border-color: var(--kp-accent);
+    scale: 1.035 1.035;
+    transition-property: scale, border-color;
+    transition-duration: 120ms;
+}
+
+.phase-pulse {
+    background-color: var(--kp-warning);
+    transition-property: background-color;
+    transition-duration: 120ms;
+}
+
+.cycles-spent-beat {
+    opacity: 0.62;
+    transition-property: opacity;
+    transition-duration: 120ms;
+}
+
+.feedback-denied {
+    border-color: var(--kp-danger);
+    translate: 4px 0;
+    transition-property: translate, border-color;
+    transition-duration: 70ms;
+}
+
+.hand-card-drawn {
+    border-color: var(--kp-beneficial);
+    translate: 0 -8px;
+    transition-property: translate, border-color;
+    transition-duration: 160ms;
+}
+
+.queue-chip-resolve {
+    border-color: var(--kp-warning);
+    scale: 1.06 1.06;
+    transition-property: scale, border-color;
+    transition-duration: 110ms;
+}
+
+.stack-chip-resolve {
+    border-color: var(--kp-lang-haskell);
+    scale: 1.08 1.08;
+    transition-property: scale, border-color;
+    transition-duration: 130ms;
+}
+
+.reduced-motion .float-number,
+.reduced-motion .feedback-card-ghost,
+.reduced-motion .damage-vignette,
+.reduced-motion .feedback-hit,
+.reduced-motion .feedback-killed,
+.reduced-motion .enemy-acting,
+.reduced-motion .phase-pulse,
+.reduced-motion .cycles-spent-beat,
+.reduced-motion .feedback-denied,
+.reduced-motion .hand-card-drawn,
+.reduced-motion .queue-chip-resolve,
+.reduced-motion .stack-chip-resolve,
+.reduced-motion .death-ghost {
+    transition-duration: 0ms;
+}
diff --git a/Assets/Resources/TerminalScrollbars.uss b/Assets/Resources/TerminalScrollbars.uss
new file mode 100644
index 0000000..b18575e
--- /dev/null
+++ b/Assets/Resources/TerminalScrollbars.uss
@@ -0,0 +1,94 @@
+:root {
+    --kp-scroll-track: var(--kp-panel);
+    --kp-scroll-thumb: var(--kp-border);
+    --kp-scroll-thumb-hover: var(--kp-primary);
+}
+
+ScrollView .unity-scroll-view__content-viewport {
+    padding-right: 2px;
+    padding-bottom: 2px;
+}
+
+ScrollView .unity-scroll-view__vertical-scroller {
+    width: 6px;
+    min-width: 6px;
+    background-color: transparent;
+    border-left-width: 0;
+    border-right-width: 0;
+    border-top-width: 0;
+    border-bottom-width: 0;
+    border-radius: 0;
+}
+
+ScrollView .unity-scroll-view__horizontal-scroller {
+    height: 6px;
+    min-height: 6px;
+    background-color: transparent;
+    border-left-width: 0;
+    border-right-width: 0;
+    border-top-width: 0;
+    border-bottom-width: 0;
+    border-radius: 0;
+}
+
+ScrollView .unity-scroller,
+ScrollView .unity-scroller--vertical,
+ScrollView .unity-scroller--horizontal,
+ScrollView .unity-scroller__slider,
+ScrollView .unity-base-slider {
+    background-color: transparent;
+    border-left-width: 0;
+    border-right-width: 0;
+    border-top-width: 0;
+    border-bottom-width: 0;
+    border-radius: 0;
+}
+
+ScrollView .unity-scroller__low-button,
+ScrollView .unity-scroller__high-button {
+    display: none;
+    width: 0;
+    height: 0;
+    min-width: 0;
+    min-height: 0;
+    background-color: transparent;
+    border-left-width: 0;
+    border-right-width: 0;
+    border-top-width: 0;
+    border-bottom-width: 0;
+}
+
+ScrollView .unity-base-slider__tracker {
+    background-color: var(--kp-scroll-track);
+    opacity: 0.28;
+    border-left-width: 0;
+    border-right-width: 0;
+    border-top-width: 0;
+    border-bottom-width: 0;
+    border-radius: 0;
+}
+
+ScrollView .unity-base-slider__dragger,
+ScrollView .unity-base-slider__dragger-border,
+ScrollView #unity-dragger {
+    min-width: 6px;
+    min-height: 6px;
+    background-color: var(--kp-scroll-thumb);
+    border-left-width: 0;
+    border-right-width: 0;
+    border-top-width: 0;
+    border-bottom-width: 0;
+    border-radius: 0;
+}
+
+ScrollView .unity-base-slider__dragger:hover,
+ScrollView .unity-base-slider__dragger-border:hover,
+ScrollView #unity-dragger:hover {
+    background-color: var(--kp-scroll-thumb-hover);
+}
+
+ScrollView .unity-base-slider__dragger:active,
+ScrollView .unity-base-slider__dragger-border:active,
+ScrollView #unity-dragger:active {
+    background-color: var(--kp-scroll-thumb-hover);
+}
diff --git a/Assets/Scripts/Combat/CardEffects.cs b/Assets/Scripts/Combat/CardEffects.cs
index f153947..8679831 100644
--- a/Assets/Scripts/Combat/CardEffects.cs
+++ b/Assets/Scripts/Combat/CardEffects.cs
@@ -43,8 +43,8 @@ namespace KernelPanic.Combat
                     continue;
                 }
 
-                int minAmount = UpgradeMath.ScaleAmount(_minAmount, context.Card);
-                int maxAmount = UpgradeMath.ScaleAmount(_maxAmount, context.Card);
+                int minAmount = UpgradeMath.ScaleAmount(UpgradeMath.ApplySourceFlatBonus(_minAmount, context), context.Card);
+                int maxAmount = UpgradeMath.ScaleAmount(UpgradeMath.ApplySourceFlatBonus(_maxAmount, context), context.Card);
                 int amount = minAmount == maxAmount
                     ? minAmount
                     : RandomRoll.RollRange(minAmount, maxAmount, new RollContext(context.Source));
@@ -77,7 +77,7 @@ namespace KernelPanic.Combat
 
         public void Execute(CombatContext context)
         {
-            int amount = UpgradeMath.ScaleShield(_amount, context.Card);
+            int amount = UpgradeMath.ScaleShield(UpgradeMath.ApplySourceFlatBonus(_amount, context), context.Card);
             context.Source.Shield += amount;
             context.CombatManager.ReportEffectResult($"gained {amount} shield");
         }
@@ -107,7 +107,7 @@ namespace KernelPanic.Combat
                 }
 
                 int roll = RandomRoll.RollRange(1, 100, new RollContext(context.Source));
-                int damageAmount = UpgradeMath.ScaleAmount(_damageAmount, context.Card);
+                int damageAmount = UpgradeMath.ScaleAmount(UpgradeMath.ApplySourceFlatBonus(_damageAmount, context), context.Card);
                 int amount = roll <= _successPercent ? damageAmount : 0;
                 context.DamagePipeline.DealDamage(new DamageRequest(context.Source, target, amount, _language, false, false));
                 context.CombatManager.ReportEffectResult(amount == 0 ? "typeof -> NaN (0)" : $"typeof -> {amount}");
@@ -136,13 +136,13 @@ namespace KernelPanic.Combat
         {
             if (_targetSelf)
             {
-                context.StatusEffects.Apply(context.Source, _statusType, UpgradeMath.ScaleAmount(_stacks, context.Card), _duration, context.Source, _skipNextTick);
+                context.StatusEffects.Apply(context.Source, _statusType, UpgradeMath.ScaleAmount(UpgradeMath.ApplySourceFlatBonus(_stacks, context), context.Card), _duration, context.Source, _skipNextTick);
                 return;
             }
 
             for (int i = 0; i < context.Targets.Count; i++)
             {
-                context.StatusEffects.Apply(context.Targets[i], _statusType, UpgradeMath.ScaleAmount(_stacks, context.Card), _duration, context.Source, _skipNextTick);
+                context.StatusEffects.Apply(context.Targets[i], _statusType, UpgradeMath.ScaleAmount(UpgradeMath.ApplySourceFlatBonus(_stacks, context), context.Card), _duration, context.Source, _skipNextTick);
             }
         }
     }
@@ -184,7 +184,15 @@ namespace KernelPanic.Combat
             }
 
             // RAM is a hard hand cap. Draw effects only pull cards that can fit; blocked cards stay in the draw pile.
-            int requested = UpgradeMath.ScaleAmount(_count, context.Card);
+            int baseCount = _count;
+            if (context.Card?.Definition?.Id == "ubuntu_ask_ubuntu"
+                && string.Equals(context.CombatManager.RunConfig?.Distro?.Id, "ubuntu", System.StringComparison.OrdinalIgnoreCase)
+                && context.CombatManager.RunConfig.DistroVersion >= 3)
+            {
+                baseCount = 3;
+            }
+
+            int requested = UpgradeMath.ScaleAmount(UpgradeMath.ApplySourceFlatBonus(baseCount, context), context.Card);
             int drawCount = UnityEngine.Mathf.Min(requested, room);
             IReadOnlyList<CardInstance> drawn = context.DeckController.Draw(drawCount);
             int added = 0;
@@ -214,8 +222,8 @@ namespace KernelPanic.Combat
 
         public void Execute(CombatContext context)
         {
-            int minCount = UpgradeMath.ScaleAmount(_minCount, context.Card);
-            int maxCount = UpgradeMath.ScaleAmount(_maxCount, context.Card);
+            int minCount = UpgradeMath.ScaleAmount(UpgradeMath.ApplySourceFlatBonus(_minCount, context), context.Card);
+            int maxCount = UpgradeMath.ScaleAmount(UpgradeMath.ApplySourceFlatBonus(_maxCount, context), context.Card);
             int targetCount = minCount == maxCount
                 ? minCount
                 : RandomRoll.RollRange(minCount, maxCount, new RollContext(context.Source));
@@ -347,11 +355,11 @@ namespace KernelPanic.Combat
                 "mint_update_manager" => Todo("TODO: update manager needs delayed repeat system."),
                 "mint_cinnamon" => Todo("TODO: cinnamon needs shield effect support."),
                 "mint_nemo" => Todo("TODO: nemo needs conditional repeat based on shield."),
-                "mint_timeshift" => Todo("TODO: timeshift snapshot needs delayed restore system."),
+                "mint_timeshift" => Todo("TODO: timeshift snapshot V3 needs delayed restore system before threshold/restore can be upgraded."),
                 "fedora_borrow_checker" => Todo("TODO: borrow checker needs shield and first-card tracking."),
                 "fedora_cargo_build" => Todo("TODO: cargo build --release needs overkill-to-shield handling."),
                 "fedora_dnf_update" => Todo("TODO: dnf update needs Java played count and cost mutation."),
-                "fedora_rawhide" => Todo("TODO: rawhide needs next-card cost mutation and crash-risk hook."),
+                "fedora_rawhide" => Todo("TODO: rawhide V3 needs permanent damage-growth doubling after growth effects exist."),
                 "fedora_selinux" => Todo("TODO: SELinux enforcing needs enemy attack mitigation statuses."),
                 _ => Todo("TODO: card effect is not implemented yet.")
             };
@@ -429,6 +437,7 @@ namespace KernelPanic.Combat
                 _ => string.IsNullOrWhiteSpace(card.Definition.Description) ? "TODO: effect not implemented." : $"{card.Definition.Description}{marker}"
             };
         }
+
     }
 
     public static class UpgradeMath
@@ -443,5 +452,9 @@ namespace KernelPanic.Combat
             return baseAmount + UnityEngine.Mathf.Max(0, card?.MagnitudeBonus ?? 0);
         }
 
+        public static int ApplySourceFlatBonus(int amount, CombatContext context)
+        {
+            return amount + UnityEngine.Mathf.Max(0, context?.Source?.FlatEffectBonus ?? 0);
+        }
     }
 }
diff --git a/Assets/Scripts/Combat/CombatManager.cs b/Assets/Scripts/Combat/CombatManager.cs
index 0e9d8f7..b4027a9 100644
--- a/Assets/Scripts/Combat/CombatManager.cs
+++ b/Assets/Scripts/Combat/CombatManager.cs
@@ -1,6 +1,7 @@
 using KernelPanic.Core;
 using KernelPanic.Data;
 using KernelPanic.Run;
+using KernelPanic.Meta;
 using UnityEngine;
 using System;
 using System.Collections.Generic;
@@ -33,6 +34,9 @@ namespace KernelPanic.Combat
         private bool awaitingWaveContinue;
         private bool runLost;
         private bool skipNextAllocateDraw;
+        private bool ubuntuEmptyHandRefillUsed;
+        private int fedoraCardsDiscountedThisTurn;
+        private int fedoraCrashChance = 10;
 
         public TurnPhase CurrentPhase => currentPhase;
         public RunConfig RunConfig => runConfig;
@@ -141,7 +145,13 @@ namespace KernelPanic.Combat
                 return false;
             }
 
+            bool fedoraBonus = CanApplyFedoraBonus();
             int cost = GetCardCost(card);
+            if (fedoraBonus)
+            {
+                cost = Mathf.Max(0, cost - 1);
+            }
+
             if (playerState.Cycles < cost)
             {
                 Log($"not enough cycles for {GetCardName(card)}");
@@ -167,6 +177,29 @@ namespace KernelPanic.Combat
             LogPlayIntent(card);
             card.SetTargetSnapshot(CaptureTargets(card));
 
+            if (fedoraBonus)
+            {
+                fedoraCardsDiscountedThisTurn++;
+                if (RandomRoll.RollRange(1, 100, new RollContext(playerState)) <= fedoraCrashChance)
+                {
+                    fedoraCrashChance = 10;
+                    if (IsDistro("fedora") && runConfig.DistroVersion >= 4)
+                    {
+                        playerState.Cycles += 1;
+                    }
+
+                    deckController.Discard(card);
+                    pendingTargetCard = null;
+                    selectedEnemyIndex = -1;
+                    Log($"{GetCardName(card)} crashed under bleeding edge");
+                    StateChanged?.Invoke();
+                    return true;
+                }
+
+                fedoraCrashChance = Mathf.Min(90, fedoraCrashChance + 10);
+                playerState.DamageMultiplierPercent = runConfig.DistroVersion >= 2 ? 175 : 150;
+            }
+
             switch (track)
             {
                 case ResolutionTrack.InterpreterQueue:
@@ -184,7 +217,10 @@ namespace KernelPanic.Combat
                     break;
             }
 
+            playerState.DamageMultiplierPercent = 100;
+
             pendingTargetCard = null;
+            TryApplyUbuntuEmptyHandRefill();
             StateChanged?.Invoke();
             return true;
         }
@@ -355,8 +391,12 @@ namespace KernelPanic.Combat
             runLost = false;
             awaitingWaveContinue = false;
             loggedEffectTodos.Clear();
+            ubuntuEmptyHandRefillUsed = false;
+            fedoraCrashChance = 10;
+            fedoraCardsDiscountedThisTurn = 0;
             RandomRoll.Seed(runConfig.RunSeed);
             playerState = new CombatantState(runManager.EffectiveMaxUptime(), runManager.EffectiveRam(), runManager.EffectiveMaxCycles());
+            ApplyVersionState(playerState);
             StartWave(preservePlayerUptime: false);
             Log($"booted {runConfig.Distro.DisplayName} with {runManager.RunDeck.Count} cards");
             StateChanged?.Invoke();
@@ -368,6 +408,7 @@ namespace KernelPanic.Combat
             if (!preservePlayerUptime || playerState == null)
             {
                 playerState = new CombatantState(runManager.EffectiveMaxUptime(), runManager.EffectiveRam(), runManager.EffectiveMaxCycles());
+                ApplyVersionState(playerState);
             }
             else
             {
@@ -379,6 +420,7 @@ namespace KernelPanic.Combat
                 playerState.Shield = 0;
                 playerState.IsDefeated = false;
                 playerState.MutableStatuses.Clear();
+                ApplyVersionState(playerState);
             }
 
             handController = new HandController(playerState.Ram);
@@ -413,12 +455,15 @@ namespace KernelPanic.Combat
             }
 
             playerState.Cycles = playerState.MaxCycles;
+            fedoraCardsDiscountedThisTurn = 0;
             statusEffects.Tick(playerState, StatusTickTiming.StartOfTurn, playerState, damagePipeline);
             if (CheckLoss())
             {
                 return;
             }
 
+            TryApplyUbuntuAptUpdate();
+
             if (skipNextAllocateDraw)
             {
                 skipNextAllocateDraw = false;
@@ -557,6 +602,71 @@ namespace KernelPanic.Combat
             }
         }
 
+        private void TryApplyUbuntuAptUpdate()
+        {
+            if (!IsDistro("ubuntu") || handController == null || playerState == null || handController.Cards.Count >= handController.RamCapacity)
+            {
+                return;
+            }
+
+            int lookCount = runConfig.DistroVersion >= 2 ? 3 : 2;
+            if (!deckController.TryDrawCheapestFromTop(lookCount, out CardInstance card))
+            {
+                return;
+            }
+
+            if (runConfig.DistroVersion >= 4)
+            {
+                card.TemporaryCostDelta -= 1;
+            }
+
+            if (handController.Add(card))
+            {
+                Log($"apt update: staged {GetCardName(card)} from top {lookCount}");
+            }
+        }
+
+        private void TryApplyUbuntuEmptyHandRefill()
+        {
+            if (!IsDistro("ubuntu") || runConfig.DistroVersion < 5 || ubuntuEmptyHandRefillUsed || handController == null || handController.Cards.Count > 0)
+            {
+                return;
+            }
+
+            ubuntuEmptyHandRefillUsed = true;
+            DrawCardsToHand(playerState.Ram, "ubuntu 24.04 refill");
+        }
+
+        private bool CanApplyFedoraBonus()
+        {
+            if (!IsDistro("fedora") || playerState == null)
+            {
+                return false;
+            }
+
+            int limit = runConfig.DistroVersion >= 5 ? 2 : 1;
+            return fedoraCardsDiscountedThisTurn < limit;
+        }
+
+        private void ApplyVersionState(CombatantState state)
+        {
+            if (state == null)
+            {
+                return;
+            }
+
+            state.forceMaxRolls = IsDistro("mint");
+            state.IgnoreDamageMultipliers = IsDistro("mint");
+            state.AllowFlatDamageBuffs = IsDistro("mint") && runConfig.DistroVersion >= 4;
+            state.FlatEffectBonus = IsDistro("mint") && runConfig.DistroVersion >= 2 ? 2 : 0;
+            state.DamageMultiplierPercent = 100;
+        }
+
+        private bool IsDistro(string id)
+        {
+            return string.Equals(runConfig?.Distro?.Id, id, StringComparison.OrdinalIgnoreCase);
+        }
+
         private CombatContext BuildContext(CardInstance card, IReadOnlyList<CombatantState> targets)
         {
             return new CombatContext(card, playerState, targets, this, damagePipeline, statusEffects, deckController, handController, enemies);
diff --git a/Assets/Scripts/Combat/CombatantState.cs b/Assets/Scripts/Combat/CombatantState.cs
index 9657e9f..c698a88 100644
--- a/Assets/Scripts/Combat/CombatantState.cs
+++ b/Assets/Scripts/Combat/CombatantState.cs
@@ -27,6 +27,10 @@ namespace KernelPanic.Combat
         public int MaxCycles { get; set; }
         public bool IsDefeated { get; set; }
         public bool forceMaxRolls { get; set; }
+        public bool IgnoreDamageMultipliers { get; set; }
+        public bool AllowFlatDamageBuffs { get; set; }
+        public int FlatEffectBonus { get; set; }
+        public int DamageMultiplierPercent { get; set; } = 100;
         public IReadOnlyList<StatusInstance> Statuses => _statuses;
         public IReadOnlyDictionary<StatusType, int> ActiveStatuses => BuildStatusSnapshot();
 
diff --git a/Assets/Scripts/Combat/DamagePipeline.cs b/Assets/Scripts/Combat/DamagePipeline.cs
index af7eb05..d1684de 100644
--- a/Assets/Scripts/Combat/DamagePipeline.cs
+++ b/Assets/Scripts/Combat/DamagePipeline.cs
@@ -74,18 +74,32 @@ namespace KernelPanic.Combat
 
         private static int ApplyMultipliers(int amount, DamageRequest request)
         {
-            // TODO: Apply buffs/debuffs and Mint's no-multiplier rule here.
-            return amount;
+            if (request.Source != null && request.Source.IgnoreDamageMultipliers)
+            {
+                // Mint V1+ ignores multiplicative damage modifiers. Mint V4 still allows flat
+                // bonuses before this step; no flat buff status exists yet, so the flag is a hook.
+                return amount;
+            }
+
+            int multiplier = request.Source == null ? 100 : Mathf.Max(0, request.Source.DamageMultiplierPercent);
+            return Mathf.RoundToInt(amount * (multiplier / 100f));
         }
 
         private static int ApplyCrit(int amount, DamageRequest request)
         {
+            if (request.Source != null && request.Source.forceMaxRolls)
+            {
+                return amount;
+            }
+
             // TODO: Add crit calculation and crit modifiers.
             return amount;
         }
 
         private static int ApplyResistancesAndWeaknesses(int amount, DamageRequest request)
         {
+            // TODO: Enemy resistances/reductions are not authored yet. Mint V5 should re-resolve
+            // a once-per-combat reduced effect here once those reduction sources exist.
             // TODO: Apply enemy language resistances and weaknesses here.
             return amount;
         }
diff --git a/Assets/Scripts/Combat/DeckController.cs b/Assets/Scripts/Combat/DeckController.cs
index 6138a43..3079962 100644
--- a/Assets/Scripts/Combat/DeckController.cs
+++ b/Assets/Scripts/Combat/DeckController.cs
@@ -55,6 +55,43 @@ namespace KernelPanic.Combat
             return drawn;
         }
 
+        public bool TryDrawCheapestFromTop(int lookCount, out CardInstance card)
+        {
+            card = null;
+            if (lookCount <= 0)
+            {
+                return false;
+            }
+
+            if (_drawPile.Count == 0)
+            {
+                ReshuffleDiscardIntoDraw();
+            }
+
+            if (_drawPile.Count == 0)
+            {
+                return false;
+            }
+
+            int inspectCount = System.Math.Min(lookCount, _drawPile.Count);
+            int selectedIndex = _drawPile.Count - 1;
+            int selectedCost = CombatManager.GetCardCost(_drawPile[selectedIndex]);
+            for (int offset = 1; offset < inspectCount; offset++)
+            {
+                int index = _drawPile.Count - 1 - offset;
+                int cost = CombatManager.GetCardCost(_drawPile[index]);
+                if (cost < selectedCost)
+                {
+                    selectedCost = cost;
+                    selectedIndex = index;
+                }
+            }
+
+            card = _drawPile[selectedIndex];
+            _drawPile.RemoveAt(selectedIndex);
+            return card != null;
+        }
+
         public void Discard(CardInstance card)
         {
             if (card != null)
diff --git a/Assets/Scripts/Meta/DistroVersionCatalog.cs b/Assets/Scripts/Meta/DistroVersionCatalog.cs
new file mode 100644
index 0000000..1dc5827
--- /dev/null
+++ b/Assets/Scripts/Meta/DistroVersionCatalog.cs
@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+
+namespace KernelPanic.Meta
+{
+    public static class DistroVersionCatalog
+    {
+        private static readonly Dictionary<string, string[]> ReleaseLabels = new(StringComparer.OrdinalIgnoreCase)
+        {
+            ["ubuntu"] = new[] { "20.04", "21.04", "22.04", "23.04", "24.04" },
+            ["fedora"] = new[] { "38", "39", "40", "41", "42" },
+            ["mint"] = new[] { "21", "21.2", "21.3", "22", "22.1" }
+        };
+
+        public static string GetReleaseLabel(string unitId, int version)
+        {
+            int safeVersion = Math.Max(1, Math.Min(GachaTuning.MaxVersion, version));
+            if (!string.IsNullOrWhiteSpace(unitId) && ReleaseLabels.TryGetValue(unitId, out string[] labels) && safeVersion <= labels.Length)
+            {
+                return labels[safeVersion - 1];
+            }
+
+            return $"V{safeVersion}";
+        }
+
+        public static string GetEffectSummary(string unitId, int version)
+        {
+            int safeVersion = Math.Max(1, Math.Min(GachaTuning.MaxVersion, version));
+            return (unitId ?? string.Empty).ToLowerInvariant() switch
+            {
+                "ubuntu" => safeVersion switch
+                {
+                    1 => "start of turn: apt update chooses the cheaper of top 2 draw cards",
+                    2 => "apt update looks at top 3 instead of top 2",
+                    3 => "ask ubuntu draws 3 instead of 2",
+                    4 => "apt update card costs 1 less this turn",
+                    5 => "once per combat, empty hand refills up to RAM",
+                    _ => "--"
+                },
+                "fedora" => safeVersion switch
+                {
+                    1 => "first card each turn costs 1 less and deals +50%, with crash risk",
+                    2 => "first-card damage bonus rises to +75%",
+                    3 => "rawhide TODO: double permanent damage growth on non-crash first-card turn",
+                    4 => "crashes grant +1 Cycle that turn",
+                    5 => "first two cards each turn get the discount, bonus, and independent crash rolls",
+                    _ => "--"
+                },
+                "mint" => safeVersion switch
+                {
+                    1 => "random values roll max; no crits; ignores multiplicative damage buffs",
+                    2 => "fixed effect values are treated as +2",
+                    3 => "timeshift snapshot TODO: stronger restore when delayed restore exists",
+                    4 => "flat +damage can apply; multiplicative crit/mult remains ignored",
+                    5 => "TODO: re-resolve reduced effect when enemy reduction/coercion exists",
+                    _ => "--"
+                },
+                _ => safeVersion == 1 ? "base release" : $"TODO: V{safeVersion} release effect"
+            };
+        }
+    }
+}
diff --git a/Assets/Scripts/Meta/GachaTuning.cs b/Assets/Scripts/Meta/GachaTuning.cs
new file mode 100644
index 0000000..a8186b4
--- /dev/null
+++ b/Assets/Scripts/Meta/GachaTuning.cs
@@ -0,0 +1,26 @@
+namespace KernelPanic.Meta
+{
+    /// <summary>
+    /// Tunable gacha progression amounts. Kept in code until designers need asset-driven economy tuning.
+    /// </summary>
+    public static class GachaTuning
+    {
+        public const int MaxVersion = 5;
+        public const int MergesPerDupe = 20;
+        public const int MergesOnCharacterBonus = 10;
+        public const float MergesMaxVersionOverflowMultiplier = 1.5f;
+        public static int DupeConsolationBandwidth => 0;
+        public static readonly int[] VersionCosts = { 50, 120, 250, 500 };
+
+        public static int GetVersionUpgradeCost(int targetVersion)
+        {
+            if (targetVersion <= 1 || targetVersion > MaxVersion)
+            {
+                return 0;
+            }
+
+            int index = targetVersion - 2;
+            return index >= 0 && index < VersionCosts.Length ? VersionCosts[index] : VersionCosts[VersionCosts.Length - 1];
+        }
+    }
+}
diff --git a/Assets/Scripts/Meta/PlayerCollection.cs b/Assets/Scripts/Meta/PlayerCollection.cs
index c496edd..7250118 100644
--- a/Assets/Scripts/Meta/PlayerCollection.cs
+++ b/Assets/Scripts/Meta/PlayerCollection.cs
@@ -10,6 +10,7 @@ namespace KernelPanic.Meta
     public sealed class PlayerCollection
     {
         private readonly List<DistroDefinition> _ownedUnits = new();
+        private readonly Dictionary<string, int> _versions = new(StringComparer.OrdinalIgnoreCase);
         private int _featuredIndex;
 
         // TODO: Populate owned units from SaveService during bootstrap.
@@ -19,16 +20,46 @@ namespace KernelPanic.Meta
         public event Action Changed;
 
         public void Add(DistroDefinition unit)
+        {
+            Add(unit, 1);
+        }
+
+        public void Add(DistroDefinition unit, int version)
+        {
+            Add(unit, version, true);
+        }
+
+        public void AddSilently(DistroDefinition unit, int version)
+        {
+            Add(unit, version, false);
+        }
+
+        private void Add(DistroDefinition unit, int version, bool notify)
         {
             if (unit == null)
             {
                 return;
             }
 
+            if (IsOwned(unit.Id))
+            {
+                SetVersion(unit.Id, version, notify);
+                return;
+            }
+
             // Persistence is wired by the owner so this domain class stays IO-free.
             _ownedUnits.Add(unit);
+            _versions[unit.Id] = Math.Max(1, version);
             _featuredIndex = Math.Clamp(_featuredIndex, 0, _ownedUnits.Count - 1);
-            Changed?.Invoke();
+            if (notify)
+            {
+                Changed?.Invoke();
+            }
+        }
+
+        public bool IsOwned(string unitId)
+        {
+            return GetOwnedCount(unitId) > 0;
         }
 
         public int GetOwnedCount(string unitId)
@@ -51,6 +82,46 @@ namespace KernelPanic.Meta
             return count;
         }
 
+        public int GetVersion(string unitId)
+        {
+            if (string.IsNullOrWhiteSpace(unitId))
+            {
+                return 0;
+            }
+
+            return _versions.TryGetValue(unitId, out int version) ? Math.Max(1, version) : IsOwned(unitId) ? 1 : 0;
+        }
+
+        public void SetVersion(string unitId, int version)
+        {
+            SetVersion(unitId, version, true);
+        }
+
+        public void SetVersionSilently(string unitId, int version)
+        {
+            SetVersion(unitId, version, false);
+        }
+
+        private void SetVersion(string unitId, int version, bool notify)
+        {
+            if (string.IsNullOrWhiteSpace(unitId) || !IsOwned(unitId))
+            {
+                return;
+            }
+
+            int safeVersion = Math.Max(1, version);
+            if (_versions.TryGetValue(unitId, out int oldVersion) && oldVersion == safeVersion)
+            {
+                return;
+            }
+
+            _versions[unitId] = safeVersion;
+            if (notify)
+            {
+                Changed?.Invoke();
+            }
+        }
+
         public void SelectNextFeatured()
         {
             if (_ownedUnits.Count < 2)
diff --git a/Assets/Scripts/Meta/PullResolver.cs b/Assets/Scripts/Meta/PullResolver.cs
new file mode 100644
index 0000000..76b436e
--- /dev/null
+++ b/Assets/Scripts/Meta/PullResolver.cs
@@ -0,0 +1,225 @@
+using System;
+using System.Collections.Generic;
+using KernelPanic.Core;
+using KernelPanic.Data;
+using UnityEngine;
+
+namespace KernelPanic.Meta
+{
+    public static class PullResolver
+    {
+        public static event Action<PullResolutionResult> PullResolved;
+
+        public static PullResolutionResult Resolve(IEnumerable<DistroDefinition> pullResults, PullResolutionContext context)
+        {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            context.SaveData ??= SaveData.CreateDefault();
+            context.SaveData.EnsureLists();
+
+            List<PullResolutionOutcome> outcomes = new();
+            if (pullResults != null)
+            {
+                foreach (DistroDefinition unit in pullResults)
+                {
+                    outcomes.Add(ResolveOne(unit, context));
+                }
+            }
+
+            PullResolutionResult result = new(outcomes);
+            PullResolved?.Invoke(result);
+            return result;
+        }
+
+        public static PullResolutionResult Resolve(IEnumerable<string> pullResultIds, PullResolutionContext context)
+        {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            List<DistroDefinition> units = new();
+            if (pullResultIds != null)
+            {
+                foreach (string id in pullResultIds)
+                {
+                    units.Add(context.DistroDatabase == null ? null : context.DistroDatabase.FindById(id));
+                }
+            }
+
+            return Resolve(units, context);
+        }
+
+        public static PullResolutionResult ResolveAndSave(IEnumerable<DistroDefinition> pullResults, PullResolutionContext context, SaveService saveService)
+        {
+            PullResolutionResult result = Resolve(pullResults, context);
+            saveService?.Save(context.SaveData);
+            return result;
+        }
+
+        public static PullResolutionResult ResolveAndSave(IEnumerable<string> pullResultIds, PullResolutionContext context, SaveService saveService)
+        {
+            PullResolutionResult result = Resolve(pullResultIds, context);
+            saveService?.Save(context.SaveData);
+            return result;
+        }
+
+        private static PullResolutionOutcome ResolveOne(DistroDefinition unit, PullResolutionContext context)
+        {
+            if (unit == null || string.IsNullOrWhiteSpace(unit.Id))
+            {
+                return new PullResolutionOutcome(null, PullOutcomeKind.Invalid, 0, Array.Empty<Language>());
+            }
+
+            OwnedUnitSaveEntry owned = context.SaveData.FindOwnedUnit(unit.Id);
+            bool ownedInCollection = context.Collection != null && context.Collection.IsOwned(unit.Id);
+            if (owned == null && !ownedInCollection)
+            {
+                IReadOnlyList<Language> before = SnapshotUnlockedLanguages(context.Collection);
+                context.SaveData.AddOwnedUnit(unit.Id, 1);
+                context.Collection?.AddSilently(unit, 1);
+                IReadOnlyList<Language> unlocked = NewlyUnlockedLanguages(before, context.Collection, unit);
+                return new PullResolutionOutcome(unit.Id, PullOutcomeKind.Granted, 0, unlocked);
+            }
+
+            owned ??= context.SaveData.AddOwnedUnit(unit.Id, context.Collection?.GetVersion(unit.Id) ?? 1);
+            int version = Mathf.Clamp(owned.version, 1, GachaTuning.MaxVersion);
+            owned.version = version;
+            bool overflow = version >= GachaTuning.MaxVersion;
+            int merges = CalculateDupeMerges(overflow, unit.Id, context.FocusUnitId);
+            context.SaveData.merges = Math.Max(0, context.SaveData.merges) + merges;
+            if (GachaTuning.DupeConsolationBandwidth > 0)
+            {
+                context.SaveData.standardPullCurrency += GachaTuning.DupeConsolationBandwidth;
+            }
+
+            context.Collection?.AddSilently(unit, version);
+            return new PullResolutionOutcome(unit.Id, overflow ? PullOutcomeKind.DupeOverflow : PullOutcomeKind.Dupe, merges, Array.Empty<Language>());
+        }
+
+        private static int CalculateDupeMerges(bool overflow, string unitId, string focusUnitId)
+        {
+            float baseAmount = GachaTuning.MergesPerDupe;
+            if (overflow)
+            {
+                baseAmount *= GachaTuning.MergesMaxVersionOverflowMultiplier;
+            }
+
+            int merges = Mathf.RoundToInt(baseAmount);
+            if (!string.IsNullOrWhiteSpace(focusUnitId) && string.Equals(unitId, focusUnitId, StringComparison.OrdinalIgnoreCase))
+            {
+                merges += GachaTuning.MergesOnCharacterBonus;
+            }
+
+            return Math.Max(1, merges);
+        }
+
+        private static IReadOnlyList<Language> SnapshotUnlockedLanguages(PlayerCollection collection)
+        {
+            List<Language> unlocked = new();
+            if (collection == null)
+            {
+                return unlocked;
+            }
+
+            IReadOnlyList<LanguageCatalogEntry> languages = LanguageCatalog.All;
+            for (int i = 0; i < languages.Count; i++)
+            {
+                if (LanguageUnlock.IsUnlocked(languages[i].Language, collection))
+                {
+                    unlocked.Add(languages[i].Language);
+                }
+            }
+
+            return unlocked;
+        }
+
+        private static IReadOnlyList<Language> NewlyUnlockedLanguages(IReadOnlyList<Language> before, PlayerCollection collection, DistroDefinition unit)
+        {
+            List<Language> unlocked = new();
+            if (collection == null || unit == null)
+            {
+                return unlocked;
+            }
+
+            AddNewlyUnlockedLanguage(unit.PrimaryLanguage, before, collection, unlocked);
+            AddNewlyUnlockedLanguage(unit.SecondaryLanguage, before, collection, unlocked);
+
+            return unlocked;
+        }
+
+        private static void AddNewlyUnlockedLanguage(Language language, IReadOnlyList<Language> before, PlayerCollection collection, List<Language> unlocked)
+        {
+            if (!ContainsLanguage(unlocked, language) && !ContainsLanguage(before, language) && LanguageUnlock.IsUnlocked(language, collection))
+            {
+                unlocked.Add(language);
+            }
+        }
+
+        private static bool ContainsLanguage(IReadOnlyList<Language> languages, Language language)
+        {
+            for (int i = 0; i < languages.Count; i++)
+            {
+                if (languages[i] == language)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+
+    public sealed class PullResolutionContext
+    {
+        public PullResolutionContext(SaveData saveData, PlayerCollection collection, DistroDatabase distroDatabase = null, string focusUnitId = null)
+        {
+            SaveData = saveData;
+            Collection = collection;
+            DistroDatabase = distroDatabase;
+            FocusUnitId = focusUnitId;
+        }
+
+        public SaveData SaveData { get; set; }
+        public PlayerCollection Collection { get; }
+        public DistroDatabase DistroDatabase { get; }
+        public string FocusUnitId { get; }
+    }
+
+    public sealed class PullResolutionResult
+    {
+        public PullResolutionResult(IReadOnlyList<PullResolutionOutcome> outcomes)
+        {
+            Outcomes = outcomes ?? Array.Empty<PullResolutionOutcome>();
+        }
+
+        public IReadOnlyList<PullResolutionOutcome> Outcomes { get; }
+    }
+
+    public readonly struct PullResolutionOutcome
+    {
+        public PullResolutionOutcome(string unitId, PullOutcomeKind kind, int mergesAwarded, IReadOnlyList<Language> languagesNewlyUnlocked)
+        {
+            UnitId = unitId;
+            Kind = kind;
+            MergesAwarded = mergesAwarded;
+            LanguagesNewlyUnlocked = languagesNewlyUnlocked ?? Array.Empty<Language>();
+        }
+
+        public string UnitId { get; }
+        public PullOutcomeKind Kind { get; }
+        public int MergesAwarded { get; }
+        public IReadOnlyList<Language> LanguagesNewlyUnlocked { get; }
+    }
+
+    public enum PullOutcomeKind
+    {
+        Invalid,
+        Granted,
+        Dupe,
+        DupeOverflow
+    }
+}
diff --git a/Assets/Scripts/Meta/SaveService.cs b/Assets/Scripts/Meta/SaveService.cs
index 556deaf..38d86fd 100644
--- a/Assets/Scripts/Meta/SaveService.cs
+++ b/Assets/Scripts/Meta/SaveService.cs
@@ -62,6 +62,8 @@ namespace KernelPanic.Meta
         public int rootCredits = GachaService.TestRootCreditsBalance;
         public int standardPullCurrency;
         public int limitedPullCurrency;
+        public int merges;
+        public List<OwnedUnitSaveEntry> ownedUnits = new();
         public List<string> ownedUnitIds = new();
         public List<string> bannerPoolIds = new();
         public GachaBannerState beginnerBannerState = new(GachaService.BeginnerBannerId);
@@ -74,6 +76,7 @@ namespace KernelPanic.Meta
 
         public void EnsureLists()
         {
+            ownedUnits ??= new List<OwnedUnitSaveEntry>();
             ownedUnitIds ??= new List<string>();
             bannerPoolIds ??= new List<string>();
             beginnerBannerState ??= new GachaBannerState(GachaService.BeginnerBannerId);
@@ -81,7 +84,114 @@ namespace KernelPanic.Meta
             beginnerBannerState.EnsureLists();
             lastRunLoadout ??= new LastRunLoadoutSaveEntry();
             lastRunLoadout.EnsureLists();
+            merges = Math.Max(0, merges);
+            MigrateLegacyOwnedUnitIds();
+            NormalizeOwnedUnits();
         }
+
+        public OwnedUnitSaveEntry FindOwnedUnit(string id)
+        {
+            if (string.IsNullOrWhiteSpace(id))
+            {
+                return null;
+            }
+
+            EnsureLists();
+            for (int i = 0; i < ownedUnits.Count; i++)
+            {
+                OwnedUnitSaveEntry entry = ownedUnits[i];
+                if (entry != null && string.Equals(entry.id, id, StringComparison.OrdinalIgnoreCase))
+                {
+                    return entry;
+                }
+            }
+
+            return null;
+        }
+
+        public bool IsUnitOwned(string id)
+        {
+            return FindOwnedUnit(id) != null;
+        }
+
+        public OwnedUnitSaveEntry AddOwnedUnit(string id, int version)
+        {
+            if (string.IsNullOrWhiteSpace(id))
+            {
+                return null;
+            }
+
+            EnsureLists();
+            OwnedUnitSaveEntry existing = FindOwnedUnit(id);
+            if (existing != null)
+            {
+                existing.version = Math.Max(1, Math.Min(GachaTuning.MaxVersion, existing.version));
+                return existing;
+            }
+
+            OwnedUnitSaveEntry entry = new()
+            {
+                id = id,
+                version = Math.Max(1, Math.Min(GachaTuning.MaxVersion, version))
+            };
+            ownedUnits.Add(entry);
+            return entry;
+        }
+
+        private void MigrateLegacyOwnedUnitIds()
+        {
+            for (int i = 0; i < ownedUnitIds.Count; i++)
+            {
+                string id = ownedUnitIds[i];
+                if (string.IsNullOrWhiteSpace(id) || HasOwnedUnitEntry(id))
+                {
+                    continue;
+                }
+
+                ownedUnits.Add(new OwnedUnitSaveEntry
+                {
+                    id = id,
+                    version = 1
+                });
+            }
+        }
+
+        private void NormalizeOwnedUnits()
+        {
+            HashSet<string> seen = new(StringComparer.OrdinalIgnoreCase);
+            for (int i = ownedUnits.Count - 1; i >= 0; i--)
+            {
+                OwnedUnitSaveEntry entry = ownedUnits[i];
+                if (entry == null || string.IsNullOrWhiteSpace(entry.id) || !seen.Add(entry.id))
+                {
+                    ownedUnits.RemoveAt(i);
+                    continue;
+                }
+
+                entry.version = Math.Max(1, Math.Min(GachaTuning.MaxVersion, entry.version));
+            }
+        }
+
+        private bool HasOwnedUnitEntry(string id)
+        {
+            for (int i = 0; i < ownedUnits.Count; i++)
+            {
+                OwnedUnitSaveEntry entry = ownedUnits[i];
+                if (entry != null && string.Equals(entry.id, id, StringComparison.OrdinalIgnoreCase))
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+
+    [Serializable]
+    public sealed class OwnedUnitSaveEntry
+    {
+        public string id;
+        public int version = 1;
     }
 
     [Serializable]
diff --git a/Assets/Scripts/Meta/VersionUpgrader.cs b/Assets/Scripts/Meta/VersionUpgrader.cs
new file mode 100644
index 0000000..abad329
--- /dev/null
+++ b/Assets/Scripts/Meta/VersionUpgrader.cs
@@ -0,0 +1,105 @@
+using System;
+using UnityEngine;
+
+namespace KernelPanic.Meta
+{
+    public static class VersionUpgrader
+    {
+        public static event Action<VersionUpgradeResult> UnitUpgraded;
+
+        public static bool TryUpgrade(string unitId, SaveData state, PlayerCollection collection, out VersionUpgradeResult result)
+        {
+            result = TryUpgrade(unitId, state, collection);
+            return result.Success;
+        }
+
+        public static VersionUpgradeResult TryUpgradeAndSave(string unitId, SaveData state, PlayerCollection collection, SaveService saveService)
+        {
+            VersionUpgradeResult result = TryUpgrade(unitId, state, collection);
+            if (result.Success)
+            {
+                saveService?.Save(state);
+            }
+
+            return result;
+        }
+
+        public static VersionUpgradeResult TryUpgrade(string unitId, SaveData state, PlayerCollection collection)
+        {
+            state ??= SaveData.CreateDefault();
+            state.EnsureLists();
+
+            OwnedUnitSaveEntry entry = state.FindOwnedUnit(unitId);
+            if (entry == null && collection != null && collection.IsOwned(unitId))
+            {
+                entry = state.AddOwnedUnit(unitId, collection.GetVersion(unitId));
+            }
+
+            if (entry == null)
+            {
+                return VersionUpgradeResult.Failed(unitId, VersionUpgradeFailureReason.NotOwned);
+            }
+
+            int currentVersion = Mathf.Clamp(entry.version, 1, GachaTuning.MaxVersion);
+            if (currentVersion >= GachaTuning.MaxVersion)
+            {
+                return VersionUpgradeResult.Failed(unitId, VersionUpgradeFailureReason.MaxVersion, currentVersion, currentVersion, 0);
+            }
+
+            int targetVersion = currentVersion + 1;
+            int cost = GachaTuning.GetVersionUpgradeCost(targetVersion);
+            if (state.merges < cost)
+            {
+                return VersionUpgradeResult.Failed(unitId, VersionUpgradeFailureReason.InsufficientMerges, currentVersion, targetVersion, cost);
+            }
+
+            state.merges -= cost;
+            entry.version = targetVersion;
+            collection?.SetVersionSilently(unitId, targetVersion);
+
+            VersionUpgradeResult result = VersionUpgradeResult.Upgraded(unitId, currentVersion, targetVersion, cost, state.merges);
+            UnitUpgraded?.Invoke(result);
+            return result;
+        }
+    }
+
+    public readonly struct VersionUpgradeResult
+    {
+        private VersionUpgradeResult(string unitId, bool success, VersionUpgradeFailureReason failureReason, int fromVersion, int toVersion, int cost, int mergesRemaining)
+        {
+            UnitId = unitId;
+            Success = success;
+            FailureReason = failureReason;
+            FromVersion = fromVersion;
+            ToVersion = toVersion;
+            Cost = cost;
+            MergesRemaining = mergesRemaining;
+        }
+
+        public string UnitId { get; }
+        public bool Success { get; }
+        public VersionUpgradeFailureReason FailureReason { get; }
+        public int FromVersion { get; }
+        public int ToVersion { get; }
+        public int Cost { get; }
+        public int MergesRemaining { get; }
+
+        public static VersionUpgradeResult Upgraded(string unitId, int fromVersion, int toVersion, int cost, int mergesRemaining)
+        {
+            return new VersionUpgradeResult(unitId, true, VersionUpgradeFailureReason.None, fromVersion, toVersion, cost, mergesRemaining);
+        }
+
+        public static VersionUpgradeResult Failed(string unitId, VersionUpgradeFailureReason reason, int fromVersion = 0, int toVersion = 0, int cost = 0)
+        {
+            return new VersionUpgradeResult(unitId, false, reason, fromVersion, toVersion, cost, 0);
+        }
+    }
+
+    public enum VersionUpgradeFailureReason
+    {
+        None,
+        NotOwned,
+        MaxVersion,
+        InsufficientMerges
+    }
+}
diff --git a/Assets/Scripts/Run/RunConfig.cs b/Assets/Scripts/Run/RunConfig.cs
index 78a6a4f..8eb922f 100644
--- a/Assets/Scripts/Run/RunConfig.cs
+++ b/Assets/Scripts/Run/RunConfig.cs
@@ -10,17 +10,23 @@ namespace KernelPanic.Run
     public sealed class RunConfig
     {
         public RunConfig(DistroDefinition distro, Language primaryLanguage, Language secondaryLanguage, IReadOnlyList<CardDefinition> startingDeck)
-            : this(distro, primaryLanguage, secondaryLanguage, startingDeck, 0)
+            : this(distro, primaryLanguage, secondaryLanguage, startingDeck, 0, 1)
         {
         }
 
         public RunConfig(DistroDefinition distro, Language primaryLanguage, Language secondaryLanguage, IReadOnlyList<CardDefinition> startingDeck, int runSeed)
+            : this(distro, primaryLanguage, secondaryLanguage, startingDeck, runSeed, 1)
+        {
+        }
+
+        public RunConfig(DistroDefinition distro, Language primaryLanguage, Language secondaryLanguage, IReadOnlyList<CardDefinition> startingDeck, int runSeed, int distroVersion)
         {
             Distro = distro;
             PrimaryLanguage = primaryLanguage;
             SecondaryLanguage = secondaryLanguage;
             StartingDeck = startingDeck;
             RunSeed = runSeed;
+            DistroVersion = UnityEngine.Mathf.Clamp(distroVersion, 1, KernelPanic.Meta.GachaTuning.MaxVersion);
         }
 
         public DistroDefinition Distro { get; }
@@ -28,5 +34,6 @@ namespace KernelPanic.Run
         public Language SecondaryLanguage { get; }
         public IReadOnlyList<CardDefinition> StartingDeck { get; }
         public int RunSeed { get; }
+        public int DistroVersion { get; }
     }
 }
diff --git a/Assets/Scripts/Run/RunContext.cs b/Assets/Scripts/Run/RunContext.cs
index e8b2485..f5726dc 100644
--- a/Assets/Scripts/Run/RunContext.cs
+++ b/Assets/Scripts/Run/RunContext.cs
@@ -18,7 +18,12 @@ namespace KernelPanic.Run
 
         public static void Set(DistroDefinition distro, IReadOnlyList<CardDefinition> equippedCards, Language primaryLanguage, Language secondaryLanguage)
         {
-            pendingRun = new PendingRun(distro, equippedCards, primaryLanguage, secondaryLanguage, Environment.TickCount);
+            Set(distro, equippedCards, primaryLanguage, secondaryLanguage, 1);
+        }
+
+        public static void Set(DistroDefinition distro, IReadOnlyList<CardDefinition> equippedCards, Language primaryLanguage, Language secondaryLanguage, int distroVersion)
+        {
+            pendingRun = new PendingRun(distro, equippedCards, primaryLanguage, secondaryLanguage, Environment.TickCount, distroVersion);
         }
 
         public static bool TryCreateRunConfig(LanguageDeckDatabase languageDeckDatabase, out RunConfig config)
@@ -41,13 +46,15 @@ namespace KernelPanic.Run
             private readonly Language primaryLanguage;
             private readonly Language secondaryLanguage;
             private readonly int runSeed;
+            private readonly int distroVersion;
 
-            public PendingRun(DistroDefinition distro, IReadOnlyList<CardDefinition> cards, Language primaryLanguage, Language secondaryLanguage, int runSeed)
+            public PendingRun(DistroDefinition distro, IReadOnlyList<CardDefinition> cards, Language primaryLanguage, Language secondaryLanguage, int runSeed, int distroVersion)
             {
                 this.distro = distro;
                 this.primaryLanguage = primaryLanguage;
                 this.secondaryLanguage = secondaryLanguage;
                 this.runSeed = runSeed;
+                this.distroVersion = distroVersion;
 
                 if (cards == null)
                 {
@@ -70,7 +77,7 @@ namespace KernelPanic.Run
                 List<CardDefinition> startingDeck = new(equippedCards);
                 AddLanguageDeck(languageDeckDatabase, primaryLanguage, startingDeck);
                 AddLanguageDeck(languageDeckDatabase, secondaryLanguage, startingDeck);
-                return new RunConfig(distro, primaryLanguage, secondaryLanguage, startingDeck, runSeed);
+                return new RunConfig(distro, primaryLanguage, secondaryLanguage, startingDeck, runSeed, distroVersion);
             }
 
             private static void AddLanguageDeck(LanguageDeckDatabase languageDeckDatabase, Language language, List<CardDefinition> target)
diff --git a/Assets/Scripts/UI/CollectionScreenController.cs b/Assets/Scripts/UI/CollectionScreenController.cs
index 2cf74de..078e6e3 100644
--- a/Assets/Scripts/UI/CollectionScreenController.cs
+++ b/Assets/Scripts/UI/CollectionScreenController.cs
@@ -18,11 +18,14 @@ namespace KernelPanic.UI
         private readonly List<VisualElement> _rows = new();
 
         private VisualElement _list;
+        private ScrollView _detailScroll;
         private VisualElement _detail;
         private FontAsset _monospaceFont;
         private LanguageDeckDatabase _languageDeckDatabase;
         private CardDatabase _cardDatabase;
         private PlayerCollection _playerCollection;
+        private Func<int> _getMergesBalance;
+        private Func<DistroDefinition, VersionUpgradeResult> _tryUpgradeUnit;
         private IReadOnlyList<DistroDefinition> _units = Array.Empty<DistroDefinition>();
         private IReadOnlyList<LanguageCatalogEntry> _languages = LanguageCatalog.All;
         private IReadOnlyList<CardEntry> _cards = Array.Empty<CardEntry>();
@@ -35,14 +38,17 @@ namespace KernelPanic.UI
 
         public event Action ViewChanged;
 
-        public void Bind(VisualElement root, FontAsset artFont, LanguageDeckDatabase deckDatabase, CardDatabase cardsDatabase, PlayerCollection collection)
+        public void Bind(VisualElement root, FontAsset artFont, LanguageDeckDatabase deckDatabase, CardDatabase cardsDatabase, PlayerCollection collection, Func<int> getMergesBalance = null, Func<DistroDefinition, VersionUpgradeResult> tryUpgradeUnit = null)
         {
             _monospaceFont = artFont;
             _languageDeckDatabase = deckDatabase;
             _cardDatabase = cardsDatabase;
             _playerCollection = collection;
+            _getMergesBalance = getMergesBalance;
+            _tryUpgradeUnit = tryUpgradeUnit;
             _list = root.Q<VisualElement>("CollectionList");
-            _detail = root.Q<VisualElement>("CollectionDetail");
+            _detailScroll = root.Q<ScrollView>("CollectionDetail");
+            _detail = _detailScroll?.contentContainer;
         }
 
         public bool IsCardSubview => _mode == CollectionMode.CardSubview;
@@ -282,7 +288,79 @@ namespace KernelPanic.UI
 
             readout.Add(details);
             _detail.Add(readout);
-            _detail.Add(BuildSubviewCommand($"> cat ~/units/{unit.Id}/cards", "exclusive packages", HasListableCards(unit), () => OpenUnitCards(unit), "no packages installed"));
+            AddVersionUpgradePanel(_detail, unit);
+            _detail.Add(BuildSubviewCommand($"cat ~/units/{unit.Id}/cards", "exclusive packages", HasListableCards(unit), () => OpenUnitCards(unit), "no packages installed"));
+        }
+
+        private void AddVersionUpgradePanel(VisualElement target, DistroDefinition unit)
+        {
+            int version = _playerCollection == null ? 1 : Mathf.Clamp(_playerCollection.GetVersion(unit.Id), 1, GachaTuning.MaxVersion);
+            string release = DistroVersionCatalog.GetReleaseLabel(unit.Id, version);
+            int merges = _getMergesBalance?.Invoke() ?? 0;
+
+            VisualElement panel = new();
+            panel.AddToClassList("version-upgrade-panel");
+
+            VisualElement summary = new();
+            summary.AddToClassList("version-upgrade-summary");
+
+            Label current = new($"{DistroPresentation.DisplayName(unit)} {release}  v{version}/{GachaTuning.MaxVersion}");
+            current.AddToClassList("version-upgrade-current");
+            summary.Add(current);
+
+            Label wallet = new(version < GachaTuning.MaxVersion ? $"merges {merges} / {GachaTuning.GetVersionUpgradeCost(version + 1)}" : $"merges {merges}");
+            wallet.AddToClassList("version-upgrade-wallet");
+            summary.Add(wallet);
+            panel.Add(summary);
+
+            if (version < GachaTuning.MaxVersion)
+            {
+                int targetVersion = version + 1;
+                int cost = GachaTuning.GetVersionUpgradeCost(targetVersion);
+                Label next = new($"next {DistroVersionCatalog.GetReleaseLabel(unit.Id, targetVersion)} - {DistroVersionCatalog.GetEffectSummary(unit.Id, targetVersion)}");
+                next.AddToClassList("version-upgrade-next");
+                panel.Add(next);
+
+                bool affordable = merges >= cost;
+                wallet.EnableInClassList(affordable ? "version-upgrade-wallet-affordable" : "version-upgrade-wallet-warning", true);
+                panel.Add(BuildCompactUpgradeCommand($"> apt full-upgrade  ({cost} merges)", affordable ? "ready" : "insufficient merges", affordable && _tryUpgradeUnit != null, () => UpgradeUnit(unit)));
+            }
+            else
+            {
+                Label next = new("latest release installed");
+                next.AddToClassList("version-upgrade-next");
+                panel.Add(next);
+                panel.Add(BuildCompactUpgradeCommand("> apt full-upgrade", "latest release", false, null));
+            }
+
+            VisualElement path = new();
+            path.AddToClassList("version-path");
+            for (int i = 1; i <= GachaTuning.MaxVersion; i++)
+            {
+                string className = i <= version ? "version-path-owned" : i == version + 1 ? "version-path-next" : "version-path-locked";
+                Label step = new($"v{i} {DistroVersionCatalog.GetReleaseLabel(unit.Id, i)}");
+                step.AddToClassList("version-path-step");
+                step.AddToClassList(className);
+                path.Add(step);
+            }
+
+            panel.Add(path);
+            target.Add(panel);
+        }
+
+        private void UpgradeUnit(DistroDefinition unit)
+        {
+            if (unit == null || _tryUpgradeUnit == null)
+            {
+                return;
+            }
+
+            VersionUpgradeResult result = _tryUpgradeUnit(unit);
+            RenderUnitDetail(unit);
+            if (!result.Success)
+            {
+                _detail.Add(BuildDetailLine("upgrade", FormatUpgradeFailure(result.FailureReason)));
+            }
         }
 
         private void RenderLanguageDetail(LanguageCatalogEntry language)
@@ -310,7 +388,7 @@ namespace KernelPanic.UI
                 return;
             }
 
-            _detail.Add(BuildSubviewCommand($"> cat ~/lang/{GetLanguageId(language.Language)}/deck", "starter deck", true, () => OpenLanguageDeck(language), null));
+            _detail.Add(BuildSubviewCommand($"cat ~/lang/{GetLanguageId(language.Language)}/deck", "starter deck", true, () => OpenLanguageDeck(language), null));
         }
 
         private void OpenUnitCards(DistroDefinition unit)
@@ -463,6 +541,28 @@ namespace KernelPanic.UI
             return row;
         }
 
+        private static VisualElement BuildCompactUpgradeCommand(string command, string state, bool enabled, Action action)
+        {
+            VisualElement row = new();
+            row.AddToClassList("version-upgrade-command");
+            row.EnableInClassList("disabled-row", !enabled);
+
+            Label commandLabel = new(command);
+            commandLabel.AddToClassList("version-upgrade-command-text");
+            Label stateLabel = new(state);
+            stateLabel.AddToClassList("version-upgrade-command-state");
+
+            row.Add(commandLabel);
+            row.Add(stateLabel);
+
+            if (enabled)
+            {
+                row.RegisterCallback<ClickEvent>(_ => action?.Invoke());
+            }
+
+            return row;
+        }
+
         private static void AddPassiveDetails(VisualElement target, DistroDefinition unit)
         {
             if (unit.Passive == null)
@@ -600,6 +700,17 @@ namespace KernelPanic.UI
             return card == null ? "--" : $"{card.Language} / {card.CycleCost}c";
         }
 
+        private static string FormatUpgradeFailure(VersionUpgradeFailureReason reason)
+        {
+            return reason switch
+            {
+                VersionUpgradeFailureReason.NotOwned => "not owned",
+                VersionUpgradeFailureReason.MaxVersion => "latest release",
+                VersionUpgradeFailureReason.InsufficientMerges => "insufficient merges",
+                _ => "upgrade failed"
+            };
+        }
+
         private static string GetLanguageId(Language language)
         {
             return language switch
diff --git a/Assets/Scripts/UI/CombatSceneController.cs b/Assets/Scripts/UI/CombatSceneController.cs
index 2f8c961..c1de0b1 100644
--- a/Assets/Scripts/UI/CombatSceneController.cs
+++ b/Assets/Scripts/UI/CombatSceneController.cs
@@ -20,6 +20,7 @@ namespace KernelPanic.UI
     public sealed class CombatSceneController : MonoBehaviour
     {
         private const string StyleResourcePath = "CombatScene";
+        private const string SharedScrollbarStyleResourcePath = "TerminalScrollbars";
         private const string FilledCycle = "●";
         private const string EmptyCycle = "○";
 
@@ -48,8 +49,18 @@ namespace KernelPanic.UI
         private VisualElement handRow;
         private VisualElement turnResourceGrid;
         private Label logLabel;
+        private VisualElement feedbackLayer;
+        private VisualElement damageVignette;
         private VisualElement overlay;
         private Color distroAccent;
+        private readonly Dictionary<CombatantState, VisualElement> combatantElements = new();
+        private readonly Dictionary<CardInstance, VisualElement> handCardElements = new();
+        private readonly Dictionary<CardInstance, VisualElement> queueChipElements = new();
+        private readonly Dictionary<CardInstance, VisualElement> stackChipElements = new();
+        private readonly Dictionary<CombatantState, int> previousUptime = new();
+        private readonly Dictionary<CombatantState, int> previousShield = new();
+        private readonly HashSet<CardInstance> knownHandCards = new();
+        private int queueCascadeIndex;
 
         private void Awake()
         {
@@ -64,9 +75,18 @@ namespace KernelPanic.UI
 
         private void OnEnable()
         {
+            root?.EnableInClassList("reduced-motion", UIPreferences.ReducedMotion);
             combatManager.StateChanged += Refresh;
             combatManager.CombatLog += HandleCombatLog;
             runManager.RepositoryChanged += Refresh;
+            GameEvents.CardPlayed += HandleCardPlayed;
+            GameEvents.CardResolved += HandleCardResolved;
+            GameEvents.PhaseChanged += HandlePhaseChanged;
+            GameEvents.DamageDealt += HandleDamageDealt;
+            GameEvents.CombatantDefeated += HandleCombatantDefeated;
+            GameEvents.EnemyWouldAct += HandleEnemyWouldAct;
+            GameEvents.PlayerDamaged += HandlePlayerDamaged;
+            GameEvents.StatusApplied += HandleStatusApplied;
         }
 
         private void Start()
@@ -101,6 +121,14 @@ namespace KernelPanic.UI
             combatManager.StateChanged -= Refresh;
             combatManager.CombatLog -= HandleCombatLog;
             runManager.RepositoryChanged -= Refresh;
+            GameEvents.CardPlayed -= HandleCardPlayed;
+            GameEvents.CardResolved -= HandleCardResolved;
+            GameEvents.PhaseChanged -= HandlePhaseChanged;
+            GameEvents.DamageDealt -= HandleDamageDealt;
+            GameEvents.CombatantDefeated -= HandleCombatantDefeated;
+            GameEvents.EnemyWouldAct -= HandleEnemyWouldAct;
+            GameEvents.PlayerDamaged -= HandlePlayerDamaged;
+            GameEvents.StatusApplied -= HandleStatusApplied;
         }
 
         private bool TryBuildRunConfig(out RunConfig config)
@@ -140,7 +168,7 @@ namespace KernelPanic.UI
 
             AddLanguageDeck(Language.Python, startingDeck);
             AddLanguageDeck(Language.JavaScript, startingDeck);
-            config = new RunConfig(distro, Language.Python, Language.JavaScript, startingDeck, Environment.TickCount);
+            config = new RunConfig(distro, Language.Python, Language.JavaScript, startingDeck, Environment.TickCount, 1);
             return true;
         }
 
@@ -182,6 +210,12 @@ namespace KernelPanic.UI
             {
                 root.styleSheets.Add(styleSheet);
             }
+
+            StyleSheet scrollbarStyleSheet = Resources.Load<StyleSheet>(SharedScrollbarStyleResourcePath);
+            if (scrollbarStyleSheet != null)
+            {
+                root.styleSheets.Add(scrollbarStyleSheet);
+            }
         }
 
         private void BuildLayout()
@@ -239,6 +273,16 @@ namespace KernelPanic.UI
             logLabel.AddToClassList("log-line");
             commandPanel.Add(logLabel);
 
+            feedbackLayer = new();
+            feedbackLayer.AddToClassList("feedback-layer");
+            feedbackLayer.pickingMode = PickingMode.Ignore;
+            root.Add(feedbackLayer);
+
+            damageVignette = new();
+            damageVignette.AddToClassList("damage-vignette");
+            damageVignette.pickingMode = PickingMode.Ignore;
+            root.Add(damageVignette);
+
             overlay = new();
             overlay.AddToClassList("overlay");
             overlay.style.display = DisplayStyle.None;
@@ -336,10 +380,13 @@ namespace KernelPanic.UI
         private void RefreshPlayer()
         {
             playerPanel.Clear();
+            combatantElements.Remove(combatManager.PlayerState);
+            combatantElements[combatManager.PlayerState] = playerPanel;
             playerPanel.Add(PanelHeader(DisplayName(runManager.CurrentConfig.Distro), "htop"));
             ApplyAccent(playerPanel);
 
             CombatantState state = combatManager.PlayerState;
+            DetectBeneficialResourceFeedback(state, playerPanel);
             playerPanel.Add(MeterBlock("uptime", state.CurrentUptime, state.MaxUptime, MeterTone.Uptime));
             playerPanel.Add(MeterBlock("shield", state.Shield, Mathf.Max(1, state.Shield), state.Shield > 0 ? MeterTone.Beneficial : MeterTone.Muted));
             playerPanel.Add(CycleBlock(state.Cycles, state.MaxCycles));
@@ -352,6 +399,8 @@ namespace KernelPanic.UI
 
         private void RefreshTracks()
         {
+            queueChipElements.Clear();
+            stackChipElements.Clear();
             FillCardStrip(interpreterStrip, combatManager.InterpreterQueue.Cards, "queue empty");
             FillCardStrip(lazyStackPile, combatManager.LazyStack.Cards, "stack empty");
             tokenArea.Clear();
@@ -361,6 +410,12 @@ namespace KernelPanic.UI
         private void RefreshEnemies()
         {
             enemyRow.Clear();
+            combatantElements.Clear();
+            if (combatManager.PlayerState != null)
+            {
+                combatantElements[combatManager.PlayerState] = playerPanel;
+            }
+
             for (int i = 0; i < combatManager.Enemies.Count; i++)
             {
                 int index = i;
@@ -377,6 +432,8 @@ namespace KernelPanic.UI
                 Label name = new(enemy.Name);
                 name.AddToClassList("enemy-name");
                 card.Add(name);
+                combatantElements[enemy.State] = card;
+                DetectBeneficialResourceFeedback(enemy.State, card);
                 card.Add(MeterBlock("uptime", enemy.CurrentUptime, enemy.MaxUptime, MeterTone.Uptime));
                 if (enemy.State.Shield > 0)
                 {
@@ -394,11 +451,27 @@ namespace KernelPanic.UI
         private void RefreshHand()
         {
             handRow.Clear();
+            handCardElements.Clear();
+            HashSet<CardInstance> currentHandCards = new();
             IReadOnlyList<CardInstance> hand = combatManager.HandController.Cards;
             for (int i = 0; i < hand.Count; i++)
             {
                 CardInstance card = hand[i];
-                handRow.Add(CardFace(card));
+                currentHandCards.Add(card);
+                VisualElement face = CardFace(card);
+                handCardElements[card] = face;
+                if (!knownHandCards.Contains(card))
+                {
+                    PlayElementBeat(face, "hand-card-drawn", 260);
+                }
+
+                handRow.Add(face);
+            }
+
+            knownHandCards.Clear();
+            foreach (CardInstance card in currentHandCards)
+            {
+                knownHandCards.Add(card);
             }
         }
 
@@ -694,7 +767,7 @@ namespace KernelPanic.UI
 
         private VisualElement CardFace(CardInstance card)
         {
-            Button button = new(() => combatManager.PlayCard(card));
+            Button button = new(() => PlayCardWithFeedback(card));
             button.text = string.Empty;
             button.AddToClassList("hand-card");
             if (combatManager.PendingTargetCard == card)
@@ -885,10 +958,350 @@ namespace KernelPanic.UI
 
             for (int i = 0; i < cards.Count; i++)
             {
-                target.Add(CardChip(cards[i]));
+                VisualElement chip = CardChip(cards[i]);
+                if (target == interpreterStrip)
+                {
+                    queueChipElements[cards[i]] = chip;
+                }
+                else if (target == lazyStackPile)
+                {
+                    stackChipElements[cards[i]] = chip;
+                }
+
+                target.Add(chip);
             }
         }
 
+        private bool PlayCardWithFeedback(CardInstance card)
+        {
+            int cyclesBefore = combatManager.PlayerState == null ? 0 : combatManager.PlayerState.Cycles;
+            bool played = combatManager.PlayCard(card);
+            if (played)
+            {
+                int spent = Mathf.Max(0, cyclesBefore - (combatManager.PlayerState == null ? cyclesBefore : combatManager.PlayerState.Cycles));
+                if (spent > 0)
+                {
+                    PlayElementBeat(turnResourceGrid, "cycles-spent-beat", 220);
+                }
+
+                return true;
+            }
+
+            if (combatManager.PendingTargetCard != card && handCardElements.TryGetValue(card, out VisualElement face))
+            {
+                PlayElementBeat(face, "feedback-denied", 220);
+            }
+
+            return false;
+        }
+
+        private void HandleCardPlayed(CardPlayedEvent payload)
+        {
+            if (payload.Card == null)
+            {
+                return;
+            }
+
+            VisualElement source = handCardElements.TryGetValue(payload.Card, out VisualElement cardElement) ? cardElement : null;
+            VisualElement destination = payload.Track switch
+            {
+                ResolutionTrack.InterpreterQueue => interpreterStrip,
+                ResolutionTrack.LazyStack => lazyStackPile,
+                _ => FirstTargetElement(payload.Card)
+            };
+
+            FlyCardGhost(payload.Card, source, destination, payload.Track == ResolutionTrack.Native ? "feedback-card-strike" : "feedback-card-route");
+        }
+
+        private void HandleCardResolved(CardResolvedEvent payload)
+        {
+            if (payload.Card == null)
+            {
+                return;
+            }
+
+            if (payload.Track == ResolutionTrack.InterpreterQueue)
+            {
+                int delay = UIPreferences.ReducedMotion ? 0 : Mathf.Min(queueCascadeIndex * 120, 600);
+                queueCascadeIndex++;
+                ScheduleFeedback(() =>
+                {
+                    VisualElement chip = queueChipElements.TryGetValue(payload.Card, out VisualElement queuedChip) ? queuedChip : interpreterStrip;
+                    PlayElementBeat(chip, "queue-chip-resolve", 260);
+                    FlyCardGhost(payload.Card, chip, turnResourceGrid, "feedback-card-discard");
+                }, delay);
+                return;
+            }
+
+            if (payload.Track == ResolutionTrack.LazyStack)
+            {
+                VisualElement chip = stackChipElements.TryGetValue(payload.Card, out VisualElement stackChip) ? stackChip : lazyStackPile;
+                PlayElementBeat(chip, "stack-chip-resolve", 320);
+                FlyCardGhost(payload.Card, chip, turnResourceGrid, "feedback-card-discard");
+            }
+        }
+
+        private void HandlePhaseChanged(PhaseChangedEvent payload)
+        {
+            if (payload.NextPhase == TurnPhase.Interpret)
+            {
+                queueCascadeIndex = 0;
+            }
+
+            ScheduleFeedback(() => PlayElementBeat(phaseLabel, "phase-pulse", 260), 0);
+        }
+
+        private void HandleDamageDealt(DamageDealtEvent payload)
+        {
+            ScheduleFeedback(() =>
+            {
+                bool isPlayer = payload.Target == combatManager.PlayerState;
+                VisualElement target = CombatantElement(payload.Target);
+                string text = payload.Amount <= 0 ? "blocked" : $"-{Mathf.RoundToInt(payload.Amount)}";
+                string tone = payload.Amount <= 0 ? "float-muted" : "float-damage";
+                if (payload.Amount >= 8)
+                {
+                    tone += " float-large";
+                }
+
+                SpawnFloatingText(target, text, tone);
+                PlayElementBeat(target, payload.Amount <= 0 ? "feedback-block" : "feedback-hit", 240);
+                if (isPlayer && payload.Amount > 0)
+                {
+                    FlashDamageVignette();
+                }
+            }, 0);
+        }
+
+        private void HandleCombatantDefeated(CombatantDefeatedEvent payload)
+        {
+            ScheduleFeedback(() =>
+            {
+                VisualElement target = CombatantElement(payload.Combatant);
+                SpawnFloatingText(target, "killed", "float-kill float-large");
+                SpawnDeathGhost(target);
+                PlayElementBeat(target, "feedback-killed", 260);
+            }, 0);
+        }
+
+        private void HandleEnemyWouldAct(EnemyWouldActEvent payload)
+        {
+            ScheduleFeedback(() => PlayElementBeat(CombatantElement(payload.Enemy?.State), "enemy-acting", 260), 0);
+        }
+
+        private void HandlePlayerDamaged(PlayerDamagedEvent payload)
+        {
+            if (payload.Amount > 0)
+            {
+                ScheduleFeedback(FlashDamageVignette, 0);
+            }
+        }
+
+        private void HandleStatusApplied(StatusAppliedEvent payload)
+        {
+            ScheduleFeedback(() =>
+            {
+                StatusDescriptor descriptor = StatusEffectController.GetDescriptor(payload.StatusType);
+                SpawnFloatingText(CombatantElement(payload.Target), $"{descriptor.IconKey} x{payload.Stacks}", descriptor.IsBeneficial ? "float-heal" : "float-status");
+                PlayElementBeat(CombatantElement(payload.Target), descriptor.IsBeneficial ? "feedback-boost" : "feedback-status", 220);
+            }, 0);
+        }
+
+        private void DetectBeneficialResourceFeedback(CombatantState state, VisualElement element)
+        {
+            if (state == null || element == null)
+            {
+                return;
+            }
+
+            if (previousUptime.TryGetValue(state, out int oldUptime) && state.CurrentUptime > oldUptime)
+            {
+                SpawnFloatingText(element, $"+{state.CurrentUptime - oldUptime}", "float-heal");
+                PlayElementBeat(element, "feedback-boost", 220);
+            }
+
+            if (previousShield.TryGetValue(state, out int oldShield) && state.Shield > oldShield)
+            {
+                SpawnFloatingText(element, $"+{state.Shield - oldShield} shield", "float-heal");
+                PlayElementBeat(element, "feedback-block", 220);
+            }
+
+            previousUptime[state] = state.CurrentUptime;
+            previousShield[state] = state.Shield;
+        }
+
+        private VisualElement CombatantElement(CombatantState state)
+        {
+            if (state != null && combatantElements.TryGetValue(state, out VisualElement element))
+            {
+                return element;
+            }
+
+            return state == combatManager.PlayerState ? playerPanel : enemyRow;
+        }
+
+        private VisualElement FirstTargetElement(CardInstance card)
+        {
+            if (card?.TargetSnapshot == null)
+            {
+                return enemyRow;
+            }
+
+            for (int i = 0; i < card.TargetSnapshot.Count; i++)
+            {
+                VisualElement element = CombatantElement(card.TargetSnapshot[i]);
+                if (element != null)
+                {
+                    return element;
+                }
+            }
+
+            return enemyRow;
+        }
+
+        private void PlayElementBeat(VisualElement element, string className, int durationMs)
+        {
+            if (element == null || string.IsNullOrWhiteSpace(className))
+            {
+                return;
+            }
+
+            element.RemoveFromClassList(className);
+            element.AddToClassList(className);
+            ScheduleFeedback(() => element.RemoveFromClassList(className), UIPreferences.ReducedMotion ? 80 : durationMs);
+        }
+
+        private void SpawnFloatingText(VisualElement anchor, string text, string className)
+        {
+            if (feedbackLayer == null || anchor == null)
+            {
+                return;
+            }
+
+            Rect anchorRect = anchor.worldBound;
+            Rect rootRect = root.worldBound;
+            Label label = new(text);
+            label.AddToClassList("float-number");
+            if (!string.IsNullOrWhiteSpace(className))
+            {
+                string[] classes = className.Split(' ');
+                for (int i = 0; i < classes.Length; i++)
+                {
+                    if (!string.IsNullOrWhiteSpace(classes[i]))
+                    {
+                        label.AddToClassList(classes[i]);
+                    }
+                }
+            }
+
+            label.style.left = anchorRect.center.x - rootRect.x - 30f;
+            label.style.top = anchorRect.center.y - rootRect.y - 16f;
+            feedbackLayer.Add(label);
+
+            if (UIPreferences.ReducedMotion)
+            {
+                label.AddToClassList("float-static");
+                ScheduleFeedback(() => label.RemoveFromHierarchy(), 420);
+                return;
+            }
+
+            ScheduleFeedback(() =>
+            {
+                label.style.top = anchorRect.center.y - rootRect.y - 42f;
+                label.style.opacity = 0f;
+            }, 20);
+            ScheduleFeedback(() => label.RemoveFromHierarchy(), 520);
+        }
+
+        private void FlyCardGhost(CardInstance card, VisualElement source, VisualElement destination, string className)
+        {
+            if (feedbackLayer == null || card == null)
+            {
+                return;
+            }
+
+            Rect rootRect = root.worldBound;
+            Rect sourceRect = source == null ? new Rect(rootRect.center.x - 70f, rootRect.center.y - 50f, 140f, 110f) : source.worldBound;
+            Rect destinationRect = destination == null ? sourceRect : destination.worldBound;
+
+            VisualElement ghost = CardFaceView(card);
+            ghost.AddToClassList("feedback-card-ghost");
+            ghost.AddToClassList(className);
+            ghost.style.position = Position.Absolute;
+            ghost.style.left = sourceRect.x - rootRect.x;
+            ghost.style.top = sourceRect.y - rootRect.y;
+            ghost.style.width = Mathf.Max(110f, sourceRect.width);
+            ghost.style.height = Mathf.Max(94f, sourceRect.height);
+            feedbackLayer.Add(ghost);
+
+            if (UIPreferences.ReducedMotion)
+            {
+                ghost.AddToClassList("feedback-card-instant");
+                ScheduleFeedback(() => ghost.RemoveFromHierarchy(), 140);
+                return;
+            }
+
+            ScheduleFeedback(() =>
+            {
+                ghost.style.left = destinationRect.center.x - rootRect.x - (sourceRect.width * 0.5f);
+                ghost.style.top = destinationRect.center.y - rootRect.y - (sourceRect.height * 0.5f);
+                ghost.style.opacity = 0f;
+            }, 20);
+            ScheduleFeedback(() => ghost.RemoveFromHierarchy(), 360);
+        }
+
+        private void SpawnDeathGhost(VisualElement source)
+        {
+            if (feedbackLayer == null || source == null)
+            {
+                return;
+            }
+
+            Rect rootRect = root.worldBound;
+            Rect sourceRect = source.worldBound;
+            VisualElement ghost = new();
+            ghost.AddToClassList("death-ghost");
+            ghost.style.position = Position.Absolute;
+            ghost.style.left = sourceRect.x - rootRect.x;
+            ghost.style.top = sourceRect.y - rootRect.y;
+            ghost.style.width = sourceRect.width;
+            ghost.style.height = sourceRect.height;
+            feedbackLayer.Add(ghost);
+
+            if (UIPreferences.ReducedMotion)
+            {
+                ScheduleFeedback(() => ghost.RemoveFromHierarchy(), 180);
+                return;
+            }
+
+            ScheduleFeedback(() =>
+            {
+                ghost.style.opacity = 0f;
+                ghost.style.scale = new Scale(new Vector3(0.92f, 0.92f, 1f));
+            }, 20);
+            ScheduleFeedback(() => ghost.RemoveFromHierarchy(), 360);
+        }
+
+        private void FlashDamageVignette()
+        {
+            if (damageVignette == null)
+            {
+                return;
+            }
+
+            PlayElementBeat(damageVignette, "damage-vignette-on", UIPreferences.ReducedMotion ? 120 : 240);
+        }
+
+        private void ScheduleFeedback(Action action, int delayMs)
+        {
+            if (action == null || root == null)
+            {
+                return;
+            }
+
+            root.schedule.Execute(action).StartingIn(Mathf.Max(0, delayMs));
+        }
+
         private void HandleCombatLog(string message)
         {
             if (logLabel != null)
diff --git a/Assets/Scripts/UI/GachaScreenController.cs b/Assets/Scripts/UI/GachaScreenController.cs
index 482459f..eac8a7e 100644
--- a/Assets/Scripts/UI/GachaScreenController.cs
+++ b/Assets/Scripts/UI/GachaScreenController.cs
@@ -31,6 +31,7 @@ namespace KernelPanic.UI
         private GachaService _gachaService;
         private PlayerCollection _playerCollection;
         private EntropyWallet _wallet;
+        private Func<IReadOnlyList<DistroDefinition>, PullResolutionResult> _resolvePulledDistros;
         private Action _onChanged;
         private Action _requestRootCreditExchange;
         private int _selectedBannerIndex;
@@ -40,13 +41,14 @@ namespace KernelPanic.UI
         private string _resultBannerId;
         private string _resultText;
 
-        public void Bind(VisualElement root, DistroDatabase database, FontAsset artFont, GachaService service, PlayerCollection collection, EntropyWallet entropyWallet, Action changedCallback, Action rootCreditExchangeCallback)
+        public void Bind(VisualElement root, DistroDatabase database, FontAsset artFont, GachaService service, PlayerCollection collection, EntropyWallet entropyWallet, Func<IReadOnlyList<DistroDefinition>, PullResolutionResult> pullResolver, Action changedCallback, Action rootCreditExchangeCallback)
         {
             _distroDatabase = database;
             _monospaceFont = artFont;
             _gachaService = service;
             _playerCollection = collection;
             _wallet = entropyWallet;
+            _resolvePulledDistros = pullResolver;
             _onChanged = changedCallback;
             _requestRootCreditExchange = rootCreditExchangeCallback;
             _bannerList = root.Q<VisualElement>("GachaBannerList");
@@ -252,18 +254,30 @@ namespace KernelPanic.UI
                 lines.Add($"entropy fallback: spent {result.EntropySpent} entropy");
             }
 
+            List<DistroDefinition> distroRewards = new();
+            for (int i = 0; i < result.Rewards.Count; i++)
+            {
+                if (result.Rewards[i].Distro != null)
+                {
+                    distroRewards.Add(result.Rewards[i].Distro);
+                }
+            }
+
+            PullResolutionResult resolution = _resolvePulledDistros?.Invoke(distroRewards);
+            int distroOutcomeIndex = 0;
             for (int i = 0; i < result.Rewards.Count; i++)
             {
                 GachaReward reward = result.Rewards[i];
-                bool duplicate = reward.Distro != null && _playerCollection.GetOwnedCount(reward.Distro.Id) > 0;
-                if (reward.Distro != null)
+                PullResolutionOutcome? outcome = null;
+                if (reward.Distro != null && resolution != null && distroOutcomeIndex < resolution.Outcomes.Count)
                 {
-                    _playerCollection.Add(reward.Distro);
+                    outcome = resolution.Outcomes[distroOutcomeIndex];
+                    distroOutcomeIndex++;
                 }
 
                 string suffix = reward.Guaranteed ? " guaranteed" : reward.PityTriggered ? " pity" : string.Empty;
-                string duplicateText = duplicate ? " duplicate" : string.Empty;
-                lines.Add($"{i + 1:00}: {reward.StarRating}-star {reward.DisplayName}{suffix}{duplicateText}");
+                string outcomeText = FormatPullOutcome(outcome);
+                lines.Add($"{i + 1:00}: {reward.StarRating}-star {reward.DisplayName}{suffix}{outcomeText}");
             }
 
             _resultBannerId = bannerId;
@@ -272,6 +286,23 @@ namespace KernelPanic.UI
             Refresh();
         }
 
+        private static string FormatPullOutcome(PullResolutionOutcome? outcome)
+        {
+            if (!outcome.HasValue)
+            {
+                return string.Empty;
+            }
+
+            PullResolutionOutcome value = outcome.Value;
+            return value.Kind switch
+            {
+                PullOutcomeKind.Granted => " granted",
+                PullOutcomeKind.Dupe => $" duplicate +{value.MergesAwarded} merges",
+                PullOutcomeKind.DupeOverflow => $" max-version duplicate +{value.MergesAwarded} merges",
+                _ => string.Empty
+            };
+        }
+
         private void RequestPullSelectedBanner(int pullCount)
         {
             string bannerId = _bannerIds[_selectedBannerIndex];
diff --git a/Assets/Scripts/UI/MainMenuController.cs b/Assets/Scripts/UI/MainMenuController.cs
index dd3f386..bb937c5 100644
--- a/Assets/Scripts/UI/MainMenuController.cs
+++ b/Assets/Scripts/UI/MainMenuController.cs
@@ -23,6 +23,7 @@ namespace KernelPanic.UI
         private const string HiddenClassName = "hidden";
         private const string SelectedClassName = "selected";
         private const string CursorOnClassName = "cursor-on";
+        private const string SharedScrollbarStyleResourcePath = "TerminalScrollbars";
         private const float BootIntroSeconds = 1.5f;
         private static bool _bootIntroPlayed;
 
@@ -133,13 +134,14 @@ namespace KernelPanic.UI
             _cardLoadout = new CardLoadout(_playerCollection.OwnedUnits);
             Initialize(new EntropyWallet()); // TODO: Replace with persistent wallet service composition.
             BindElements();
+            LoadSharedStyles();
             BindCommandEntries();
             RegisterCommandEntryCallbacks();
             featuredUnitPanel.Bind(_root, monospaceFont);
-            collectionScreen.Bind(_root, monospaceFont, languageDeckDatabase, cardDatabase, _playerCollection);
+            collectionScreen.Bind(_root, monospaceFont, languageDeckDatabase, cardDatabase, _playerCollection, GetMergesBalance, UpgradeCollectionUnit);
             BindScreenFrames();
             starterSelection.Bind(_root, distroDatabase, HandleStarterConfirmed);
-            gachaScreen.Bind(_root, distroDatabase, monospaceFont, _gachaService, _playerCollection, _wallet, HandleMetaStateChanged, OpenRootCreditExchange);
+            gachaScreen.Bind(_root, distroDatabase, monospaceFont, _gachaService, _playerCollection, _wallet, ResolvePulledDistros, HandleMetaStateChanged, OpenRootCreditExchange);
             LoadMetaState();
             _playerCollection.Changed += HandleMetaStateChanged;
             _gachaService.Changed += HandleMetaStateChanged;
@@ -221,6 +223,15 @@ namespace KernelPanic.UI
             _collectionLanguagesButton = _root.Q<Button>("CollectionLanguagesButton");
         }
 
+        private void LoadSharedStyles()
+        {
+            StyleSheet scrollbarStyleSheet = Resources.Load<StyleSheet>(SharedScrollbarStyleResourcePath);
+            if (scrollbarStyleSheet != null)
+            {
+                _root.styleSheets.Add(scrollbarStyleSheet);
+            }
+        }
+
         private void BindScreenFrames()
         {
             _runSetupFrame.Bind(_runSetupPanel, "$ ./start_run --configure", "[esc] back   [arrows] navigate   [enter] select   [b] boot run", ShowMainMenu);
@@ -554,12 +565,13 @@ namespace KernelPanic.UI
             _saveData.EnsureLists();
             _wallet.SetBalance(_saveData.entropyBalance);
 
-            for (int i = 0; i < _saveData.ownedUnitIds.Count; i++)
+            for (int i = 0; i < _saveData.ownedUnits.Count; i++)
             {
-                DistroDefinition unit = ResolveSavedDistro(_saveData.ownedUnitIds[i]);
+                OwnedUnitSaveEntry entry = _saveData.ownedUnits[i];
+                DistroDefinition unit = ResolveSavedDistro(entry?.id);
                 if (unit != null)
                 {
-                    _playerCollection.Add(unit);
+                    _playerCollection.Add(unit, entry.version);
                 }
             }
 
@@ -624,7 +636,7 @@ namespace KernelPanic.UI
 
         private void HandleStarterConfirmed(DistroDefinition picked, IReadOnlyList<DistroDefinition> remaining)
         {
-            _playerCollection.Add(picked);
+            _playerCollection.Add(picked, 1);
             AddAllFourStarDistrosToBeginnerBannerPool();
             _gachaService.SetBeginnerGuaranteedDistros(remaining);
             _saveData.starterChosen = true;
@@ -639,6 +651,7 @@ namespace KernelPanic.UI
             _saveData ??= SaveData.CreateDefault();
             _saveData.EnsureLists();
             _saveData.entropyBalance = _wallet == null ? 0 : _wallet.Balance;
+            _saveData.ownedUnits.Clear();
             _saveData.ownedUnitIds.Clear();
             _saveData.bannerPoolIds.Clear();
             _gachaService.WriteProgress(_saveData);
@@ -648,7 +661,11 @@ namespace KernelPanic.UI
                 DistroDefinition unit = _playerCollection.OwnedUnits[i];
                 if (unit != null && !string.IsNullOrWhiteSpace(unit.Id))
                 {
-                    _saveData.ownedUnitIds.Add(unit.Id);
+                    _saveData.ownedUnits.Add(new OwnedUnitSaveEntry
+                    {
+                        id = unit.Id,
+                        version = Mathf.Clamp(_playerCollection.GetVersion(unit.Id), 1, GachaTuning.MaxVersion)
+                    });
                 }
             }
 
@@ -664,6 +681,38 @@ namespace KernelPanic.UI
             _saveService.Save(_saveData);
         }
 
+        private PullResolutionResult ResolvePulledDistros(IReadOnlyList<DistroDefinition> pulledDistros)
+        {
+            PullResolutionContext context = new(_saveData, _playerCollection, distroDatabase, _playerCollection.FeaturedUnit?.Id);
+            return PullResolver.Resolve(pulledDistros, context);
+        }
+
+        private int GetMergesBalance()
+        {
+            _saveData ??= SaveData.CreateDefault();
+            _saveData.EnsureLists();
+            return _saveData.merges;
+        }
+
+        private VersionUpgradeResult UpgradeCollectionUnit(DistroDefinition unit)
+        {
+            if (unit == null)
+            {
+                return VersionUpgradeResult.Failed(null, VersionUpgradeFailureReason.NotOwned);
+            }
+
+            VersionUpgradeResult result = VersionUpgrader.TryUpgrade(unit.Id, _saveData, _playerCollection);
+            if (result.Success)
+            {
+                SaveCurrentState();
+                featuredUnitPanel.Refresh(_playerCollection.OwnedUnits, _playerCollection.FeaturedUnit);
+                collectionScreen.RefreshUnits(_playerCollection.OwnedUnits);
+                RefreshCurrencyReadouts();
+            }
+
+            return result;
+        }
+
         private void SaveLastRunLoadout(DistroDefinition unit, IReadOnlyList<string> cardIds)
         {
             _saveData ??= SaveData.CreateDefault();
@@ -708,7 +757,7 @@ namespace KernelPanic.UI
             _rootCreditsToEntropyButton?.SetEnabled(true);
             bool showPullTokens = IsGachaVisible();
             _pullTokensLabel.text = showPullTokens
-                ? $"bandwidth={_gachaService.PullTokens} compute-credits={_gachaService.LimitedPullTokens}"
+                ? $"bandwidth={_gachaService.PullTokens} compute-credits={_gachaService.LimitedPullTokens} merges={_saveData.merges}"
                 : string.Empty;
             _pullTokensLabel.EnableInClassList(HiddenClassName, !showPullTokens);
         }
@@ -1452,7 +1501,7 @@ namespace KernelPanic.UI
             }
 
             SaveLastRunLoadout(unit, equippedCardIds);
-            RunContext.Set(unit, BuildEquippedCardDefinitions(unit, equippedCardIds), _selectedRunLanguages[0], _selectedRunLanguages[1]);
+            RunContext.Set(unit, BuildEquippedCardDefinitions(unit, equippedCardIds), _selectedRunLanguages[0], _selectedRunLanguages[1], _playerCollection.GetVersion(unit.Id));
             SceneLoader.LoadGame();
         }
 
diff --git a/Assets/UI/CollectionScreen.uxml b/Assets/UI/CollectionScreen.uxml
index fd90ebb..6ae34ca 100644
--- a/Assets/UI/CollectionScreen.uxml
+++ b/Assets/UI/CollectionScreen.uxml
@@ -11,7 +11,7 @@
                 </ui:VisualElement>
                 <ui:VisualElement name="CollectionContent" class="collection-shell">
                     <ui:ScrollView name="CollectionList" class="collection-list" />
-                    <ui:VisualElement name="CollectionDetail" class="collection-detail" />
+                    <ui:ScrollView name="CollectionDetail" class="collection-detail" />
                 </ui:VisualElement>
             </ui:VisualElement>
             <ui:VisualElement class="screen-frame-footer">
diff --git a/Assets/UI/MainMenu.uss b/Assets/UI/MainMenu.uss
index 9b01c0a..cb64da5 100644
--- a/Assets/UI/MainMenu.uss
+++ b/Assets/UI/MainMenu.uss
@@ -8,6 +8,9 @@
     --kp-border: #1d3b2a;
     --kp-hover: #102018;
     --kp-amber: #ffbf5c;
+    --kp-scroll-track: var(--kp-panel);
+    --kp-scroll-thumb: var(--kp-muted);
+    --kp-scroll-thumb-hover: var(--kp-primary-dim);
 }
 
 .terminal-root {
@@ -774,8 +777,8 @@ Button {
 .collection-detail {
     flex-grow: 1;
     min-width: 0;
-    overflow: hidden;
-    padding: 16px;
+    min-height: 0;
+    padding: 0;
     border-left-width: 1px;
     border-right-width: 1px;
     border-top-width: 1px;
@@ -787,14 +790,141 @@ Button {
     background-color: var(--kp-panel);
 }
 
+.collection-detail .unity-scroll-view__content-container {
+    min-width: 0;
+    padding: 16px;
+}
+
 .collection-detail-readout {
     flex-direction: row;
+    flex-shrink: 0;
     margin-top: 12px;
+    margin-bottom: 12px;
+    padding-top: 10px;
+    padding-bottom: 10px;
+    border-top-width: 1px;
+    border-bottom-width: 1px;
+    border-top-color: var(--kp-border);
+    border-bottom-color: var(--kp-border);
+    overflow: hidden;
+}
+
+.version-upgrade-panel {
+    flex-shrink: 0;
+    margin-top: 4px;
+    margin-bottom: 10px;
+    padding: 10px 10px;
+    border-left-width: 1px;
+    border-right-width: 1px;
+    border-top-width: 1px;
+    border-bottom-width: 1px;
+    border-left-color: var(--kp-border);
+    border-right-color: var(--kp-border);
+    border-top-color: var(--kp-border);
+    border-bottom-color: var(--kp-border);
+    background-color: var(--kp-bg-solid);
+}
+
+.version-upgrade-summary {
+    flex-direction: row;
+    align-items: center;
+    margin-bottom: 4px;
+}
+
+.version-upgrade-current {
+    flex-grow: 1;
+    min-width: 0;
+    color: var(--kp-primary);
+    -unity-font-style: bold;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.version-upgrade-wallet {
+    color: var(--kp-muted);
+    min-width: 110px;
+    -unity-text-align: middle-right;
+}
+
+.version-upgrade-wallet-affordable {
+    color: var(--kp-primary);
+}
+
+.version-upgrade-wallet-warning {
+    color: var(--kp-amber);
+}
+
+.version-upgrade-next {
+    color: var(--kp-muted);
+    font-size: 13px;
+    white-space: normal;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    margin-bottom: 5px;
+}
+
+.version-upgrade-command {
+    min-height: 26px;
+    flex-direction: row;
+    align-items: center;
+    padding-left: 8px;
+    padding-right: 8px;
+    border-left-width: 2px;
+    border-left-color: var(--kp-primary);
+    background-color: var(--kp-hover);
+}
+
+.version-upgrade-command:hover {
+    background-color: var(--kp-panel);
+}
+
+.version-upgrade-command-text {
+    flex-grow: 1;
+    min-width: 0;
+    color: var(--kp-primary);
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.version-upgrade-command-state {
+    color: var(--kp-muted);
+    min-width: 120px;
+    -unity-text-align: middle-right;
+}
+
+.version-path {
+    flex-direction: row;
+    flex-wrap: wrap;
+    margin-top: 8px;
+}
+
+.version-path-step {
+    color: var(--kp-muted);
+    font-size: 12px;
+    margin-right: 14px;
+    margin-bottom: 5px;
+}
+
+.version-path-owned {
+    color: var(--kp-primary);
+}
+
+.version-path-next {
+    color: var(--kp-amber);
+    -unity-font-style: bold;
+}
+
+.version-path-locked {
+    color: var(--kp-muted);
+    opacity: 0.65;
 }
 
 .collection-detail-values {
     flex-grow: 1;
     min-width: 0;
+    padding-left: 12px;
 }
 
 .collection-detail .kv-value {
@@ -1039,27 +1169,6 @@ Button {
     margin-top: 18px;
 }
 
-ScrollView .unity-scroll-view__vertical-scroller,
-ScrollView .unity-scroll-view__horizontal-scroller {
-    width: 6px;
-    background-color: var(--kp-panel);
-}
-
-ScrollView .unity-scroller__low-button,
-ScrollView .unity-scroller__high-button {
-    display: none;
-}
-
-ScrollView .unity-base-slider__tracker {
-    background-color: var(--kp-panel);
-    border-radius: 0;
-}
-
-ScrollView .unity-base-slider__dragger {
-    background-color: var(--kp-muted);
-    border-radius: 0;
-}
-
 .modal-overlay {
     position: absolute;
     left: 0;