refactor: SaveSystem now uses a DTO for player state serialization and PlayerDeathComponent delegates state changes to event handlers.

Autoloads/AchievementManager.cs

@@ -1,23 +1,22 @@
 using Godot;
-using Godot.Collections;
 using Mr.BrickAdventures.scripts.Resources;
+using Mr.BrickAdventures.scripts.State;
 
 namespace Mr.BrickAdventures.Autoloads;
 
+/// <summary>
+/// Manages achievements using GameStateStore.
+/// </summary>
 public partial class AchievementManager : Node
 {
     [Export] private string AchievementsFolderPath = "res://achievements/";
     [Export] private PackedScene AchievementPopupScene { get; set; }
 
     private System.Collections.Generic.Dictionary<string, AchievementResource> _achievements = new();
-    private Array<string> _unlockedAchievementIds = [];
-    private GameManager _gameManager;
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
         LoadAchievementsFromFolder();
-        LoadUnlockedAchievements();
     }
 
     private void LoadAchievementsFromFolder()
@@ -45,6 +44,14 @@ public partial class AchievementManager : Node
         }
     }
 
+    /// <summary>
+    /// Gets the list of unlocked achievement IDs from the store.
+    /// </summary>
+    private System.Collections.Generic.List<string> GetUnlockedIds()
+    {
+        return GameStateStore.Instance?.Player.UnlockedAchievements ?? new System.Collections.Generic.List<string>();
+    }
+
     public void UnlockAchievement(string achievementId)
     {
         if (!_achievements.TryGetValue(achievementId, out var achievement))
@@ -53,13 +60,14 @@ public partial class AchievementManager : Node
             return;
         }
 
-        if (_unlockedAchievementIds.Contains(achievementId))
+        var unlockedIds = GetUnlockedIds();
+        if (unlockedIds.Contains(achievementId))
         {
             return; // Already unlocked
         }
 
-        // 1. Mark as unlocked internally
-        _unlockedAchievementIds.Add(achievementId);
+        // 1. Mark as unlocked
+        unlockedIds.Add(achievementId);
         GD.Print($"Achievement Unlocked: {achievement.DisplayName}");
 
         // 2. Show the UI popup
@@ -75,31 +83,19 @@ public partial class AchievementManager : Node
         {
             SteamManager.UnlockAchievement(achievement.Id);
         }
-        
-        // 4. Save progress
-        SaveUnlockedAchievements();
     }
 
     public void LockAchievement(string achievementId)
     {
-        if (_unlockedAchievementIds.Contains(achievementId))
+        var unlockedIds = GetUnlockedIds();
+        if (unlockedIds.Contains(achievementId))
         {
-            _unlockedAchievementIds.Remove(achievementId);
-            SaveUnlockedAchievements();
+            unlockedIds.Remove(achievementId);
         }
     }
 
-    private void SaveUnlockedAchievements()
+    public bool IsAchievementUnlocked(string achievementId)
     {
-        _gameManager.PlayerState["unlocked_achievements"] = _unlockedAchievementIds;
-        // You might want to trigger a save game here, depending on your SaveSystem
-    }
-
-    private void LoadUnlockedAchievements()
-    {
-        if (_gameManager.PlayerState.TryGetValue("unlocked_achievements", out var unlocked))
-        {
-            _unlockedAchievementIds = (Array<string>)unlocked;
-        }
+        return GetUnlockedIds().Contains(achievementId);
     }
 }

Autoloads/ConsoleManager.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.scripts.components;
 
 namespace Mr.BrickAdventures.Autoloads;
@@ -12,9 +13,9 @@ public partial class ConsoleManager : Node
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        _achievementManager = GetNode<AchievementManager>("/root/AchievementManager");
-        _skillManager = GetNode<SkillManager>("/root/SkillManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+        _achievementManager = GetNode<AchievementManager>(Constants.AchievementManagerPath);
+        _skillManager = GetNode<SkillManager>(Constants.SkillManagerPath);
     }
 
     private void AddCoinsCommand(int amount)

Autoloads/EventBus.cs

@@ -1,9 +1,151 @@
 using Godot;
+using Mr.BrickAdventures.scripts.components;
+using Mr.BrickAdventures.scripts.Resources;
 
 namespace Mr.BrickAdventures.Autoloads;
 
+/// <summary>
+/// Global event bus for decoupled communication between game systems.
+/// Use the static Instance property for easy access from anywhere.
+/// </summary>
 public partial class EventBus : Node
 {
+    /// <summary>
+    /// Singleton instance. Available after the autoload is initialized.
+    /// </summary>
+    public static EventBus Instance { get; private set; }
+
+    public override void _Ready()
+    {
+        Instance = this;
+    }
+
+    public override void _ExitTree()
+    {
+        if (Instance == this)
+            Instance = null;
+    }
+
+    #region Level Events
+
     [Signal] public delegate void LevelStartedEventHandler(int levelIndex, Node currentScene);
     [Signal] public delegate void LevelCompletedEventHandler(int levelIndex, Node currentScene, double completionTime);
+    [Signal] public delegate void LevelRestartedEventHandler(int levelIndex);
+
+    public static void EmitLevelStarted(int levelIndex, Node currentScene)
+        => Instance?.EmitSignal(SignalName.LevelStarted, levelIndex, currentScene);
+
+    public static void EmitLevelCompleted(int levelIndex, Node currentScene, double completionTime)
+        => Instance?.EmitSignal(SignalName.LevelCompleted, levelIndex, currentScene, completionTime);
+
+    public static void EmitLevelRestarted(int levelIndex)
+        => Instance?.EmitSignal(SignalName.LevelRestarted, levelIndex);
+
+    #endregion
+
+    #region Player Events
+
+    [Signal] public delegate void PlayerSpawnedEventHandler(PlayerController player);
+    [Signal] public delegate void PlayerDiedEventHandler(Vector2 position);
+    [Signal] public delegate void PlayerDamagedEventHandler(float damage, float remainingHealth, Vector2 position);
+    [Signal] public delegate void PlayerHealedEventHandler(float amount, float newHealth, Vector2 position);
+
+    public static void EmitPlayerSpawned(PlayerController player)
+        => Instance?.EmitSignal(SignalName.PlayerSpawned, player);
+
+    public static void EmitPlayerDied(Vector2 position)
+        => Instance?.EmitSignal(SignalName.PlayerDied, position);
+
+    public static void EmitPlayerDamaged(float damage, float remainingHealth, Vector2 position)
+        => Instance?.EmitSignal(SignalName.PlayerDamaged, damage, remainingHealth, position);
+
+    public static void EmitPlayerHealed(float amount, float newHealth, Vector2 position)
+        => Instance?.EmitSignal(SignalName.PlayerHealed, amount, newHealth, position);
+
+    #endregion
+
+    #region Combat Events
+
+    [Signal] public delegate void EnemyDefeatedEventHandler(Node enemy, Vector2 position);
+    [Signal] public delegate void EnemyDamagedEventHandler(Node enemy, float damage, Vector2 position);
+
+    public static void EmitEnemyDefeated(Node enemy, Vector2 position)
+        => Instance?.EmitSignal(SignalName.EnemyDefeated, enemy, position);
+
+    public static void EmitEnemyDamaged(Node enemy, float damage, Vector2 position)
+        => Instance?.EmitSignal(SignalName.EnemyDamaged, enemy, damage, position);
+
+    #endregion
+
+    #region Collection Events
+
+    [Signal] public delegate void CoinCollectedEventHandler(int amount, Vector2 position);
+    [Signal] public delegate void ItemCollectedEventHandler(CollectableType itemType, float amount, Vector2 position);
+    [Signal] public delegate void ChildRescuedEventHandler(Vector2 position);
+
+    public static void EmitCoinCollected(int amount, Vector2 position)
+        => Instance?.EmitSignal(SignalName.CoinCollected, amount, position);
+
+    public static void EmitItemCollected(CollectableType itemType, float amount, Vector2 position)
+        => Instance?.EmitSignal(SignalName.ItemCollected, (int)itemType, amount, position);
+
+    public static void EmitChildRescued(Vector2 position)
+        => Instance?.EmitSignal(SignalName.ChildRescued, position);
+
+    #endregion
+
+    #region Skill Events
+
+    [Signal] public delegate void SkillUnlockedEventHandler(string skillName, int level);
+    [Signal] public delegate void SkillActivatedEventHandler(string skillName);
+    [Signal] public delegate void SkillDeactivatedEventHandler(string skillName);
+
+    public static void EmitSkillUnlocked(string skillName, int level = 1)
+        => Instance?.EmitSignal(SignalName.SkillUnlocked, skillName, level);
+
+    public static void EmitSkillActivated(string skillName)
+        => Instance?.EmitSignal(SignalName.SkillActivated, skillName);
+
+    public static void EmitSkillDeactivated(string skillName)
+        => Instance?.EmitSignal(SignalName.SkillDeactivated, skillName);
+
+    #endregion
+
+    #region Game State Events
+
+    [Signal] public delegate void GamePausedEventHandler();
+    [Signal] public delegate void GameResumedEventHandler();
+    [Signal] public delegate void GameSavedEventHandler();
+    [Signal] public delegate void GameStartedEventHandler();
+    [Signal] public delegate void GameContinuedEventHandler();
+
+    public static void EmitGamePaused()
+        => Instance?.EmitSignal(SignalName.GamePaused);
+
+    public static void EmitGameResumed()
+        => Instance?.EmitSignal(SignalName.GameResumed);
+
+    public static void EmitGameSaved()
+        => Instance?.EmitSignal(SignalName.GameSaved);
+
+    public static void EmitGameStarted()
+        => Instance?.EmitSignal(SignalName.GameStarted);
+
+    public static void EmitGameContinued()
+        => Instance?.EmitSignal(SignalName.GameContinued);
+
+    #endregion
+
+    #region State Change Events
+
+    [Signal] public delegate void CoinsChangedEventHandler(int totalCoins);
+    [Signal] public delegate void LivesChangedEventHandler(int lives);
+
+    public static void EmitCoinsChanged(int totalCoins)
+        => Instance?.EmitSignal(SignalName.CoinsChanged, totalCoins);
+
+    public static void EmitLivesChanged(int lives)
+        => Instance?.EmitSignal(SignalName.LivesChanged, lives);
+
+    #endregion
 }

Autoloads/GameManager.cs

@@ -3,15 +3,20 @@ using Godot;
 using Godot.Collections;
 using Mr.BrickAdventures.scripts.components;
 using Mr.BrickAdventures.scripts.Resources;
-using Double = System.Double;
+using Mr.BrickAdventures.scripts.State;
 
 namespace Mr.BrickAdventures.Autoloads;
 
+/// <summary>
+/// Game orchestrator - handles scene management and game flow.
+/// State is delegated to GameStateStore for better separation of concerns.
+/// </summary>
 public partial class GameManager : Node
 {
     [Export] public Array<PackedScene> LevelScenes { get; set; } = [];
 
-    public PlayerController Player {
+    public PlayerController Player
+    {
         get => GetPlayer();
         private set => _player = value;
     }
@@ -19,25 +24,11 @@ public partial class GameManager : Node
     private List<Node> _sceneNodes = [];
     private PlayerController _player;
     private SpeedRunManager _speedRunManager;
-    private EventBus _eventBus;
 
-    [Export] 
-    public Dictionary PlayerState { get; set; } = new()
-    {
-        { "coins", 0 },
-        { "lives", 3 },
-        { "current_level", 0 },
-        { "completed_levels", new Array<int>() },
-        { "unlocked_levels", new Array<int>() {0}},
-        { "unlocked_skills", new Array<SkillData>() }
-    };
-    
-    [Export]
-    public Dictionary CurrentSessionState { get; private set; } = new()
-    {
-        { "coins_collected", 0 },
-        { "skills_unlocked", new Array<SkillData>() }
-    };
+    /// <summary>
+    /// Lazy accessor for GameStateStore - avoids initialization order issues.
+    /// </summary>
+    private GameStateStore Store => GameStateStore.Instance;
 
     public override void _EnterTree()
     {
@@ -54,8 +45,7 @@ public partial class GameManager : Node
 
     public override void _Ready()
     {
-        _speedRunManager = GetNode<SpeedRunManager>("/root/SpeedRunManager");
-        _eventBus = GetNode<EventBus>("/root/EventBus");
+        _speedRunManager = GetNode<SpeedRunManager>(Constants.SpeedRunManagerPath);
     }
 
     private void OnNodeAdded(Node node)
@@ -72,57 +62,71 @@ public partial class GameManager : Node
         }
     }
 
+    #region Coin Operations
+
     public void AddCoins(int amount)
     {
-        PlayerState["coins"] = Mathf.Max(0, (int)PlayerState["coins"] + amount);
-    }
-    
-    public void SetCoins(int amount) => PlayerState["coins"] = Mathf.Max(0, amount);
-    
-    public int GetCoins() => (int)PlayerState["coins"] + (int)CurrentSessionState["coins_collected"];
-    
-    public void RemoveCoins(int amount)
-    {
-        var sessionCoins = (int)CurrentSessionState["coins_collected"];
-        if (amount <= sessionCoins)
+        if (Store != null)
         {
-            CurrentSessionState["coins_collected"] = sessionCoins - amount;
+            Store.Player.Coins += amount;
+            EventBus.EmitCoinsChanged(Store.GetTotalCoins());
         }
-        else
-        {
-            var remaining = amount - sessionCoins;
-            CurrentSessionState["coins_collected"] = 0;
-            PlayerState["coins"] = Mathf.Max(0, (int)PlayerState["coins"] - remaining);
-        }
-        PlayerState["coins"] = Mathf.Max(0, (int)PlayerState["coins"]);
     }
 
-    public void AddLives(int amount) => PlayerState["lives"] = (int)PlayerState["lives"] + amount;
-    public void RemoveLives(int amount) => PlayerState["lives"] = (int)PlayerState["lives"] - amount;
-    public void SetLives(int amount) => PlayerState["lives"] = amount;
-    public int GetLives() => (int)PlayerState["lives"];
-    
-    public bool IsSkillUnlocked(SkillData skill)
+    public void SetCoins(int amount)
     {
-        return ((Array)PlayerState["unlocked_skills"]).Contains(skill)
-               || ((Array)CurrentSessionState["skills_unlocked"]).Contains(skill);
+        if (Store != null)
+        {
+            Store.Player.Coins = Mathf.Max(0, amount);
+            EventBus.EmitCoinsChanged(Store.GetTotalCoins());
+        }
     }
 
+    public int GetCoins() => Store?.GetTotalCoins() ?? 0;
+
+    public void RemoveCoins(int amount) => Store?.RemoveCoins(amount);
+
+    #endregion
+
+    #region Lives Operations
+
+    public void AddLives(int amount) => Store?.AddLives(amount);
+    public void RemoveLives(int amount) => Store?.RemoveLife();
+    public void SetLives(int amount)
+    {
+        if (Store != null)
+        {
+            Store.Player.Lives = amount;
+            EventBus.EmitLivesChanged(amount);
+        }
+    }
+    public int GetLives() => Store?.Player.Lives ?? 0;
+
+    #endregion
+
+    #region Skill Operations
+
+    public bool IsSkillUnlocked(SkillData skill) => Store?.IsSkillUnlocked(skill) ?? false;
+
     public void UnlockSkill(SkillData skill)
     {
-        if (!IsSkillUnlocked(skill))
-            ((Array)PlayerState["unlocked_skills"]).Add(skill);
+        if (Store != null && !Store.IsSkillUnlocked(skill))
+        {
+            Store.Player.UnlockedSkills.Add(skill);
+        }
     }
 
     public void RemoveSkill(string skillName)
     {
-        var arr = (Array)PlayerState["unlocked_skills"];
-        foreach (SkillData s in arr)
+        if (Store == null) return;
+        var skills = Store.Player.UnlockedSkills;
+        for (int i = 0; i < skills.Count; i++)
         {
-            if (s.Name != skillName) continue;
-            
-            arr.Remove(s);
-            break;
+            if (skills[i].Name == skillName)
+            {
+                skills.RemoveAt(i);
+                break;
+            }
         }
     }
 
@@ -132,81 +136,84 @@ public partial class GameManager : Node
             UnlockSkill(s);
     }
 
-    public void ResetPlayerState()
+    public Array<SkillData> GetUnlockedSkills()
     {
-        PlayerState = new Dictionary
-        {
-            { "coins", 0 },
-            { "lives", 3 },
-            { "current_level", 0 },
-            { "completed_levels", new Array<int>() },
-            { "unlocked_levels", new Array<int>() {0}},
-            { "unlocked_skills", new Array<SkillData>() },
-            { "statistics", new Godot.Collections.Dictionary<string, Variant>()}
-        };
+        if (Store == null) return new Array<SkillData>();
+
+        var result = new Array<SkillData>();
+        foreach (var s in Store.Player.UnlockedSkills)
+            result.Add(s);
+        foreach (var s in Store.Session.SkillsUnlocked)
+            if (!result.Contains(s)) result.Add(s);
+        return result;
     }
 
-    public void UnlockLevel(int levelIndex)
-    {
-        var unlocked = (Array)PlayerState["unlocked_levels"];
-        if (!unlocked.Contains(levelIndex)) unlocked.Add(levelIndex);
-    }
+    #endregion
+
+    #region Level Operations
+
+    public void UnlockLevel(int levelIndex) => Store?.UnlockLevel(levelIndex);
+
+    public void MarkLevelComplete(int levelIndex) => Store?.MarkLevelComplete(levelIndex);
 
     public void TryToGoToNextLevel()
     {
-        var next = (int)PlayerState["current_level"] + 1;
-        var unlocked = (Array)PlayerState["unlocked_levels"];
-        if (next < LevelScenes.Count && unlocked.Contains(next))
+        if (Store == null) return;
+
+        var next = Store.Session.CurrentLevel + 1;
+        if (next < LevelScenes.Count && Store.IsLevelUnlocked(next))
         {
-            PlayerState["current_level"] = next;
+            Store.Session.CurrentLevel = next;
             GetTree().ChangeSceneToPacked(LevelScenes[next]);
-            _eventBus.EmitSignal(EventBus.SignalName.LevelStarted, next, GetTree().CurrentScene);
+            EventBus.EmitLevelStarted(next, GetTree().CurrentScene);
         }
     }
 
-    public void MarkLevelComplete(int levelIndex)
-    {
-        UnlockLevel(levelIndex + 1);
-        var completed = (Array)PlayerState["completed_levels"];
-        if (!completed.Contains(levelIndex)) completed.Add(levelIndex);
-    }
+    #endregion
 
-    public void ResetCurrentSessionState()
-    {
-        CurrentSessionState = new Dictionary
-        {
-            { "coins_collected", 0 },
-            { "skills_unlocked", new Array<SkillData>() }
-        };
-    }
+    #region State Reset
+
+    public void ResetPlayerState() => Store?.ResetAll();
+
+    public void ResetCurrentSessionState() => Store?.ResetSession();
+
+    #endregion
+
+    #region Game Flow
 
     public void RestartGame()
     {
-        ResetPlayerState();
-        ResetCurrentSessionState();
+        Store?.ResetAll();
         GetTree().ChangeSceneToPacked(LevelScenes[0]);
-        GetNode<SaveSystem>("/root/SaveSystem").SaveGame();
+        GetNode<SaveSystem>(Constants.SaveSystemPath).SaveGame();
     }
 
     public void QuitGame() => GetTree().Quit();
 
-    public void PauseGame() => Engine.TimeScale = 0;
-    public void ResumeGame() => Engine.TimeScale = 1;
+    public void PauseGame()
+    {
+        Engine.TimeScale = 0;
+        EventBus.EmitGamePaused();
+    }
+
+    public void ResumeGame()
+    {
+        Engine.TimeScale = 1;
+        EventBus.EmitGameResumed();
+    }
 
     public void StartNewGame()
     {
-        ResetPlayerState();
-        ResetCurrentSessionState();
-        
+        Store?.ResetAll();
         _speedRunManager?.StartTimer();
-        
         GetTree().ChangeSceneToPacked(LevelScenes[0]);
-        GetNode<SaveSystem>("/root/SaveSystem").SaveGame();
+        GetNode<SaveSystem>(Constants.SaveSystemPath).SaveGame();
+        EventBus.EmitGameStarted();
     }
 
     public void ContinueGame()
     {
-        var save = GetNode<SaveSystem>("/root/SaveSystem");
+        var save = GetNode<SaveSystem>(Constants.SaveSystemPath);
         if (!save.LoadGame())
         {
             GD.PrintErr("Failed to load game. Starting a new game instead.");
@@ -214,41 +221,38 @@ public partial class GameManager : Node
             return;
         }
 
-        var idx = (int)PlayerState["current_level"];
+        var idx = Store?.Session.CurrentLevel ?? 0;
         if (idx < LevelScenes.Count)
+        {
             GetTree().ChangeSceneToPacked(LevelScenes[idx]);
+            EventBus.EmitGameContinued();
+        }
         else
+        {
             GD.PrintErr("No levels unlocked to continue.");
+        }
     }
 
     public void OnLevelComplete()
     {
-        var levelIndex = (int)PlayerState["current_level"];
-        MarkLevelComplete(levelIndex);
+        if (Store == null) return;
 
-        AddCoins((int)CurrentSessionState["coins_collected"]);
-        foreach (var s in (Array)CurrentSessionState["skills_unlocked"])
-            UnlockSkill((SkillData)s);
+        var levelIndex = Store.Session.CurrentLevel;
+        Store.MarkLevelComplete(levelIndex);
+        Store.CommitSessionCoins();
+        Store.CommitSessionSkills();
 
         var completionTime = _speedRunManager?.GetCurrentLevelTime() ?? 0.0;
-        _eventBus.EmitSignal(EventBus.SignalName.LevelCompleted, levelIndex, GetTree().CurrentScene, completionTime);
+        EventBus.EmitLevelCompleted(levelIndex, GetTree().CurrentScene, completionTime);
 
-        ResetCurrentSessionState();
+        Store.ResetSession();
         TryToGoToNextLevel();
-        GetNode<SaveSystem>("/root/SaveSystem").SaveGame();
+        GetNode<SaveSystem>(Constants.SaveSystemPath).SaveGame();
     }
 
-    public Array<SkillData> GetUnlockedSkills()
-    {
-        var unlocked = (Array<SkillData>)PlayerState["unlocked_skills"];
-        var session = (Array<SkillData>)CurrentSessionState["skills_unlocked"];
-        if (session!.Count == 0) return unlocked;
-        if (unlocked!.Count == 0) return session;
-        var joined = new Array<SkillData>();
-        joined.AddRange(unlocked);
-        joined.AddRange(session);
-        return joined;
-    }
+    #endregion
+
+    #region Player Lookup
 
     public PlayerController GetPlayer()
     {
@@ -267,4 +271,6 @@ public partial class GameManager : Node
         GD.PrintErr("PlayerController not found in the scene tree.");
         return null;
     }
+
+    #endregion
 }

Autoloads/GameStateStore.cs

@@ -0,0 +1,185 @@
+using Godot;
+using Mr.BrickAdventures.scripts.Resources;
+using Mr.BrickAdventures.scripts.State;
+
+namespace Mr.BrickAdventures.Autoloads;
+
+/// <summary>
+/// Central store for game state - single source of truth.
+/// Use the static Instance property for easy access.
+/// </summary>
+public partial class GameStateStore : Node
+{
+    /// <summary>
+    /// Singleton instance.
+    /// </summary>
+    public static GameStateStore Instance { get; private set; }
+
+    /// <summary>
+    /// Persistent player state (saved to disk).
+    /// </summary>
+    public PlayerState Player { get; set; } = new();
+
+    /// <summary>
+    /// Current session state (transient, reset on death/level complete).
+    /// </summary>
+    public SessionState Session { get; set; } = new();
+
+    public override void _Ready()
+    {
+        Instance = this;
+    }
+
+    public override void _ExitTree()
+    {
+        if (Instance == this)
+            Instance = null;
+    }
+
+    #region Coin Operations
+
+    /// <summary>
+    /// Gets total coins (saved + session).
+    /// </summary>
+    public int GetTotalCoins() => Player.Coins + Session.CoinsCollected;
+
+    /// <summary>
+    /// Adds coins to the session (not saved until level complete).
+    /// </summary>
+    public void AddSessionCoins(int amount)
+    {
+        Session.CoinsCollected += amount;
+        EventBus.EmitCoinsChanged(GetTotalCoins());
+    }
+
+    /// <summary>
+    /// Commits session coins to player state.
+    /// </summary>
+    public void CommitSessionCoins()
+    {
+        Player.Coins += Session.CoinsCollected;
+        Session.CoinsCollected = 0;
+    }
+
+    /// <summary>
+    /// Removes coins, first from session then from saved.
+    /// </summary>
+    public void RemoveCoins(int amount)
+    {
+        if (amount <= Session.CoinsCollected)
+        {
+            Session.CoinsCollected -= amount;
+        }
+        else
+        {
+            var remaining = amount - Session.CoinsCollected;
+            Session.CoinsCollected = 0;
+            Player.Coins = Mathf.Max(0, Player.Coins - remaining);
+        }
+        EventBus.EmitCoinsChanged(GetTotalCoins());
+    }
+
+    #endregion
+
+    #region Lives Operations
+
+    /// <summary>
+    /// Decrements lives by 1.
+    /// </summary>
+    public void RemoveLife()
+    {
+        Player.Lives = Mathf.Max(0, Player.Lives - 1);
+        EventBus.EmitLivesChanged(Player.Lives);
+    }
+
+    /// <summary>
+    /// Adds lives.
+    /// </summary>
+    public void AddLives(int amount)
+    {
+        Player.Lives += amount;
+        EventBus.EmitLivesChanged(Player.Lives);
+    }
+
+    #endregion
+
+    #region Level Operations
+
+    /// <summary>
+    /// Unlocks a level for access.
+    /// </summary>
+    public void UnlockLevel(int levelIndex)
+    {
+        if (!Player.UnlockedLevels.Contains(levelIndex))
+            Player.UnlockedLevels.Add(levelIndex);
+    }
+
+    /// <summary>
+    /// Marks a level as completed and unlocks the next.
+    /// </summary>
+    public void MarkLevelComplete(int levelIndex)
+    {
+        if (!Player.CompletedLevels.Contains(levelIndex))
+            Player.CompletedLevels.Add(levelIndex);
+        UnlockLevel(levelIndex + 1);
+    }
+
+    /// <summary>
+    /// Checks if a level is unlocked.
+    /// </summary>
+    public bool IsLevelUnlocked(int levelIndex) => Player.UnlockedLevels.Contains(levelIndex);
+
+    #endregion
+
+    #region Skill Operations
+
+    /// <summary>
+    /// Checks if a skill is unlocked (saved or session).
+    /// </summary>
+    public bool IsSkillUnlocked(SkillData skill)
+    {
+        return Player.UnlockedSkills.Contains(skill) || Session.SkillsUnlocked.Contains(skill);
+    }
+
+    /// <summary>
+    /// Unlocks a skill in the session.
+    /// </summary>
+    public void UnlockSkillInSession(SkillData skill)
+    {
+        if (!IsSkillUnlocked(skill))
+            Session.SkillsUnlocked.Add(skill);
+    }
+
+    /// <summary>
+    /// Commits session skills to player state.
+    /// </summary>
+    public void CommitSessionSkills()
+    {
+        foreach (var skill in Session.SkillsUnlocked)
+        {
+            if (!Player.UnlockedSkills.Contains(skill))
+                Player.UnlockedSkills.Add(skill);
+        }
+        Session.SkillsUnlocked.Clear();
+    }
+
+    #endregion
+
+    #region Reset Operations
+
+    /// <summary>
+    /// Resets only the session state.
+    /// </summary>
+    public void ResetSession() => Session.Reset();
+
+    /// <summary>
+    /// Resets everything to defaults.
+    /// </summary>
+    public void ResetAll()
+    {
+        Player.Reset();
+        Session.ResetAll();
+    }
+
+    #endregion
+}

Autoloads/GameStateStore.cs.uid

@@ -0,0 +1 @@
+uid://bwrhkipwecytk

Autoloads/SaveSystem.cs

@@ -1,61 +1,180 @@
+using System.Collections.Generic;
+using System.Text.Json;
 using Godot;
-using Godot.Collections;
 using Mr.BrickAdventures.scripts.Resources;
+using Mr.BrickAdventures.scripts.State;
 
 namespace Mr.BrickAdventures.Autoloads;
 
+/// <summary>
+/// Save system that serializes state to JSON using DTOs.
+/// </summary>
 public partial class SaveSystem : Node
 {
-    [Export] public string SavePath { get; set; } = "user://savegame.save";
-    [Export] public int Version { get; set; } = 1;
+    [Export] public string SavePath { get; set; } = "user://savegame.json";
+    [Export] public int Version { get; set; } = 2;
 
-    private GameManager _gameManager;
-
-    public override void _Ready()
+    private static readonly JsonSerializerOptions JsonOptions = new()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-    }
+        WriteIndented = true,
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+    };
 
     public void SaveGame()
     {
-        var saveData = new Dictionary
+        var store = GameStateStore.Instance;
+        if (store == null)
         {
-            { "player_state", _gameManager.PlayerState},
-            { "version", Version}
+            GD.PrintErr("SaveSystem: GameStateStore not available.");
+            return;
+        }
+
+        // Convert to DTO (only serializable data)
+        var saveData = new SaveDataDto
+        {
+            Version = Version,
+            Coins = store.Player.Coins,
+            Lives = store.Player.Lives,
+            CurrentLevel = store.Session.CurrentLevel,
+            CompletedLevels = [.. store.Player.CompletedLevels],
+            UnlockedLevels = new List<int>(store.Player.UnlockedLevels),
+            UnlockedSkillNames = GetSkillNames(store.Player.UnlockedSkills),
+            UnlockedAchievements = new List<string>(store.Player.UnlockedAchievements),
+            Statistics = new Dictionary<string, int>(store.Player.Statistics)
         };
 
-        using var file = FileAccess.Open(SavePath, FileAccess.ModeFlags.Write);
-        file.StoreVar(saveData);
-        GD.Print("Game state saved to: ", SavePath);
+        try
+        {
+            var json = JsonSerializer.Serialize(saveData, JsonOptions);
+            using var file = FileAccess.Open(SavePath, FileAccess.ModeFlags.Write);
+            file.StoreString(json);
+            GD.Print("Game saved to: ", SavePath);
+            EventBus.EmitGameSaved();
+        }
+        catch (System.Exception e)
+        {
+            GD.PrintErr($"SaveSystem: Failed to save game: {e.Message}");
+        }
     }
 
     public bool LoadGame()
     {
         if (!FileAccess.FileExists(SavePath))
-            return false;
-
-        using var file = FileAccess.Open(SavePath, FileAccess.ModeFlags.Read);
-        var saveDataObj = (Dictionary)file.GetVar();
-
-        if (saveDataObj.ContainsKey("version") && (int)saveDataObj["version"] != Version)
         {
-            GD.Print($"Save file version mismatch. Expected: {Version}, Found: {saveDataObj["version"]}");
+            GD.Print("SaveSystem: No save file found.");
             return false;
         }
 
-        GD.Print("Game state loaded from: ", SavePath);
-        GD.Print("Player state: ", saveDataObj["player_state"]);
-        _gameManager.PlayerState = (Dictionary)saveDataObj["player_state"];
-        
-        var skills = new Array<SkillData>();
-        foreach (var skill in (Array<SkillData>)_gameManager.PlayerState["unlocked_skills"])
+        try
         {
-            skills.Add(skill);
+            using var file = FileAccess.Open(SavePath, FileAccess.ModeFlags.Read);
+            var json = file.GetAsText();
+            var saveData = JsonSerializer.Deserialize<SaveDataDto>(json, JsonOptions);
+
+            if (saveData == null)
+            {
+                GD.PrintErr("SaveSystem: Failed to deserialize save data.");
+                return false;
+            }
+
+            if (saveData.Version != Version)
+            {
+                GD.PrintErr($"SaveSystem: Version mismatch. Expected {Version}, found {saveData.Version}");
+                return false;
+            }
+
+            var store = GameStateStore.Instance;
+            if (store == null)
+            {
+                GD.PrintErr("SaveSystem: GameStateStore not available.");
+                return false;
+            }
+
+            // Apply loaded state
+            store.Player.Coins = saveData.Coins;
+            store.Player.Lives = saveData.Lives;
+            store.Session.CurrentLevel = saveData.CurrentLevel;
+
+            store.Player.CompletedLevels = saveData.CompletedLevels ?? new List<int>();
+            store.Player.UnlockedLevels = saveData.UnlockedLevels ?? new List<int> { 0 };
+            store.Player.UnlockedAchievements = saveData.UnlockedAchievements ?? new List<string>();
+            store.Player.Statistics = saveData.Statistics ?? new Dictionary<string, int>();
+
+            // Reload skills by name from SkillManager
+            store.Player.UnlockedSkills = LoadSkillsByName(saveData.UnlockedSkillNames);
+
+            GD.Print("Game loaded from: ", SavePath);
+            return true;
+        }
+        catch (System.Exception e)
+        {
+            GD.PrintErr($"SaveSystem: Failed to load game: {e.Message}");
+            return false;
+        }
+    }
+
+    private static List<string> GetSkillNames(List<SkillData> skills)
+    {
+        var names = new List<string>();
+        foreach (var skill in skills)
+        {
+            if (skill != null)
+                names.Add(skill.Name);
+        }
+        return names;
+    }
+
+    private List<SkillData> LoadSkillsByName(List<string> skillNames)
+    {
+        var skills = new List<SkillData>();
+        if (skillNames == null) return skills;
+
+        var skillManager = GetNodeOrNull<SkillManager>(Constants.SkillManagerPath);
+        if (skillManager == null)
+        {
+            GD.PrintErr("SaveSystem: SkillManager not available to resolve skill names.");
+            return skills;
         }
 
-        _gameManager.UnlockSkills(skills);
-        return true;
+        foreach (var name in skillNames)
+        {
+            var skill = skillManager.GetSkillByName(name);
+            if (skill != null)
+            {
+                skills.Add(skill);
+            }
+            else
+            {
+                GD.PrintErr($"SaveSystem: Skill '{name}' not found in SkillManager.");
+            }
+        }
+        return skills;
     }
 
     public bool CheckSaveExists() => FileAccess.FileExists(SavePath);
+
+    public void DeleteSave()
+    {
+        if (FileAccess.FileExists(SavePath))
+        {
+            DirAccess.RemoveAbsolute(ProjectSettings.GlobalizePath(SavePath));
+            GD.Print("Save file deleted.");
+        }
+    }
+}
+
+/// <summary>
+/// Serializable DTO for save data - no Godot types.
+/// </summary>
+public class SaveDataDto
+{
+    public int Version { get; set; }
+    public int Coins { get; set; }
+    public int Lives { get; set; }
+    public int CurrentLevel { get; set; }
+    public List<int> CompletedLevels { get; set; }
+    public List<int> UnlockedLevels { get; set; }
+    public List<string> UnlockedSkillNames { get; set; }
+    public List<string> UnlockedAchievements { get; set; }
+    public Dictionary<string, int> Statistics { get; set; }
 }

Autoloads/SkillManager.cs

@@ -2,6 +2,7 @@ using System.Collections.Generic;
 using System.Linq;
 using Godot;
 using Godot.Collections;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.scripts.components;
 using Mr.BrickAdventures.scripts.interfaces;
 using Mr.BrickAdventures.scripts.Resources;
@@ -24,7 +25,7 @@ public partial class SkillManager : Node
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
     }
 
     /// <summary>
@@ -114,7 +115,7 @@ public partial class SkillManager : Node
 
         if (instance is BrickThrowComponent btc)
         {
-           EmitSignalActiveThrowSkillChanged(btc);
+            EmitSignalActiveThrowSkillChanged(btc);
         }
     }
 

Autoloads/StatisticsManager.cs

@@ -1,32 +1,21 @@
+using System.Collections.Generic;
 using Godot;
-using Godot.Collections;
+using Mr.BrickAdventures.scripts.State;
 
 namespace Mr.BrickAdventures.Autoloads;
 
+/// <summary>
+/// Manages game statistics using GameStateStore.
+/// </summary>
 public partial class StatisticsManager : Node
 {
-    private GameManager _gameManager;
-    private AchievementManager _achievementManager;
-    private Dictionary<string, Variant> _stats = new();
 
-    public override void _Ready()
+    /// <summary>
+    /// Gets the statistics dictionary from the store.
+    /// </summary>
+    private Dictionary<string, int> GetStats()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        _achievementManager = GetNode<AchievementManager>("/root/AchievementManager");
-        LoadStatistics();
-    }
-
-    private void LoadStatistics()
-    {
-        if (_gameManager.PlayerState.TryGetValue("statistics", out var statsObj))
-        {
-            _stats = (Dictionary<string, Variant>)statsObj;
-        }
-        else
-        {
-            _stats = new Dictionary<string, Variant>();
-            _gameManager.PlayerState["statistics"] = _stats;
-        }
+        return GameStateStore.Instance?.Player.Statistics ?? new Dictionary<string, int>();
     }
 
     /// <summary>
@@ -34,45 +23,40 @@ public partial class StatisticsManager : Node
     /// </summary>
     public void IncrementStat(string statName, int amount = 1)
     {
-        if (_stats.TryGetValue(statName, out var currentValue))
+        var stats = GetStats();
+        if (stats.TryGetValue(statName, out var currentValue))
         {
-            _stats[statName] = (int)currentValue + amount;
+            stats[statName] = currentValue + amount;
         }
         else
         {
-            _stats[statName] = amount;
+            stats[statName] = amount;
         }
-        GD.Print($"Stat '{statName}' updated to: {_stats[statName]}");
-        CheckAchievementsForStat(statName);
+    }
+
+    /// <summary>
+    /// Sets a statistic to a specific value.
+    /// </summary>
+    public void SetStat(string statName, int value)
+    {
+        var stats = GetStats();
+        stats[statName] = value;
     }
 
     /// <summary>
     /// Gets the value of a statistic.
     /// </summary>
-    public Variant GetStat(string statName, Variant defaultValue = default)
+    public int GetStat(string statName)
     {
-        return _stats.TryGetValue(statName, out var value) ? value : defaultValue;
+        var stats = GetStats();
+        return stats.TryGetValue(statName, out var value) ? value : 0;
     }
 
     /// <summary>
-    /// Checks if the updated stat meets the criteria for any achievements.
+    /// Gets a copy of all statistics.
     /// </summary>
-    private void CheckAchievementsForStat(string statName)
+    public Dictionary<string, int> GetAllStats()
     {
-        switch (statName)
-        {
-            case "enemies_defeated":
-                if ((int)GetStat(statName, 0) >= 100)
-                {
-                    _achievementManager.UnlockAchievement("slayer_100_enemies");
-                }
-                break;
-            case "jumps_made":
-                if ((int)GetStat(statName, 0) >= 1000)
-                {
-                    _achievementManager.UnlockAchievement("super_jumper");
-                }
-                break;
-        }
+        return new Dictionary<string, int>(GetStats());
     }
 }

objects/entities/brick_player.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=58 format=3 uid="uid://bqi5s710xb1ju"]
+[gd_scene load_steps=57 format=3 uid="uid://bqi5s710xb1ju"]
 
 [ext_resource type="Script" uid="uid://csel4s0e4g5uf" path="res://scripts/components/PlayerController.cs" id="1_yysbb"]
 [ext_resource type="Shader" uid="uid://bs4xvm4qkurpr" path="res://shaders/hit_flash.tres" id="2_lgb3u"]
@@ -19,7 +19,6 @@
 [ext_resource type="PackedScene" uid="uid://dre1vit1m4d2n" path="res://objects/movement_abilities/grid_movement_ability.tscn" id="8_xuhvf"]
 [ext_resource type="Script" uid="uid://dy78ak8eykw6e" path="res://scripts/components/FlipComponent.cs" id="9_yysbb"]
 [ext_resource type="Script" uid="uid://mnjg3p0aw1ow" path="res://scripts/components/CanPickUpComponent.cs" id="10_yysbb"]
-[ext_resource type="Script" uid="uid://ccqb8kd5m0eh7" path="res://scripts/components/ScoreComponent.cs" id="11_o1ihh"]
 [ext_resource type="Script" uid="uid://dgb8bqcri7nsj" path="res://scripts/components/HealthComponent.cs" id="12_ur2y5"]
 [ext_resource type="Script" uid="uid://byw1legrv1ep2" path="res://scripts/components/PlayerDeathComponent.cs" id="13_7til7"]
 [ext_resource type="Script" uid="uid://cecelixl41t3j" path="res://scripts/components/InvulnerabilityComponent.cs" id="15_xuhvf"]
@@ -175,9 +174,6 @@ shape = SubResource("RectangleShape2D_vad0t")
 [node name="CanPickUpComponent" type="Node" parent="."]
 script = ExtResource("10_yysbb")
 
-[node name="ScoreComponent" type="Node" parent="."]
-script = ExtResource("11_o1ihh")
-
 [node name="HealthComponent" type="Node2D" parent="." node_paths=PackedStringArray("HurtSfx", "HealSfx")]
 script = ExtResource("12_ur2y5")
 HurtSfx = NodePath("../sfx_hurt")

project.godot

@@ -29,7 +29,6 @@ config/icon="uid://jix7wdn0isr3"
 
 [autoload]
 
-GameManager="*res://objects/game_manager.tscn"
 PhantomCameraManager="*res://addons/phantom_camera/scripts/managers/phantom_camera_manager.gd"
 AudioController="*res://objects/audio_controller.tscn"
 UIManager="*res://Autoloads/UIManager.cs"
@@ -46,6 +45,12 @@ EventBus="*res://Autoloads/EventBus.cs"
 StatisticsManager="*res://Autoloads/StatisticsManager.cs"
 SpeedRunManager="res://Autoloads/SpeedRunManager.cs"
 GhostManager="res://objects/ghost_manager.tscn"
+StatisticsEventHandler="*res://scripts/Events/StatisticsEventHandler.cs"
+CoinStateHandler="*res://scripts/Events/CoinStateHandler.cs"
+LevelStateHandler="*res://scripts/Events/LevelStateHandler.cs"
+LivesStateHandler="*res://scripts/Events/LivesStateHandler.cs"
+GameStateStore="*res://Autoloads/GameStateStore.cs"
+GameManager="*res://objects/game_manager.tscn"
 
 [debug]
 

scripts/Constants.cs

@@ -0,0 +1,25 @@
+namespace Mr.BrickAdventures;
+
+/// <summary>
+/// Constants for autoload paths and other commonly used values.
+/// </summary>
+public static class Constants
+{
+    // Autoload paths
+    public const string EventBusPath = "/root/EventBus";
+    public const string GameManagerPath = "/root/GameManager";
+    public const string GameStateStorePath = "/root/GameStateStore";
+    public const string SaveSystemPath = "/root/SaveSystem";
+    public const string SpeedRunManagerPath = "/root/SpeedRunManager";
+    public const string GhostManagerPath = "/root/GhostManager";
+    public const string AchievementManagerPath = "/root/AchievementManager";
+    public const string StatisticsManagerPath = "/root/StatisticsManager";
+    public const string SkillManagerPath = "/root/SkillManager";
+    public const string FloatingTextManagerPath = "/root/FloatingTextManager";
+    public const string UIManagerPath = "/root/UIManager";
+    public const string ConsoleManagerPath = "/root/ConsoleManager";
+    public const string ConfigFileHandlerPath = "/root/ConfigFileHandler";
+
+    // Group names
+    public const string CoinsGroup = "coins";
+}

scripts/Constants.cs.uid

@@ -0,0 +1 @@
+uid://bn7o3n3bomvrd

scripts/Events/CoinStateHandler.cs

@@ -0,0 +1,29 @@
+using Godot;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+/// <summary>
+/// Handles coin collection events and updates the GameStateStore.
+/// Replaces the manual coin logic in GameManager.
+/// </summary>
+public partial class CoinStateHandler : Node
+{
+    public override void _Ready()
+    {
+        EventBus.Instance.CoinCollected += OnCoinCollected;
+    }
+
+    public override void _ExitTree()
+    {
+        if (EventBus.Instance != null)
+        {
+            EventBus.Instance.CoinCollected -= OnCoinCollected;
+        }
+    }
+
+    private void OnCoinCollected(int amount, Vector2 position)
+    {
+        GameStateStore.Instance?.AddSessionCoins(amount);
+    }
+}

scripts/Events/CoinStateHandler.cs.uid

@@ -0,0 +1 @@
+uid://1qg3q53kkh0k

scripts/Events/GhostEventHandler.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.Events;
@@ -10,11 +11,10 @@ public partial class GhostEventHandler : Node
 
     public override void _Ready()
     {
-        _ghostManager = GetNode<GhostManager>("/root/GhostManager");
-        var eventBus = GetNode<EventBus>("/root/EventBus");
+        _ghostManager = GetNode<GhostManager>(Constants.GhostManagerPath);
 
-        eventBus.LevelStarted += OnLevelStarted;
-        eventBus.LevelCompleted += OnLevelCompleted;
+        EventBus.Instance.LevelStarted += OnLevelStarted;
+        EventBus.Instance.LevelCompleted += OnLevelCompleted;
     }
 
     private void OnLevelStarted(int levelIndex, Node currentScene)

scripts/Events/LevelStateHandler.cs

@@ -0,0 +1,39 @@
+using Godot;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+/// <summary>
+/// Handles level completion events and updates GameStateStore.
+/// </summary>
+public partial class LevelStateHandler : Node
+{
+    public override void _Ready()
+    {
+        EventBus.Instance.LevelCompleted += OnLevelCompleted;
+    }
+
+    public override void _ExitTree()
+    {
+        if (EventBus.Instance != null)
+        {
+            EventBus.Instance.LevelCompleted -= OnLevelCompleted;
+        }
+    }
+
+    private void OnLevelCompleted(int levelIndex, Node currentScene, double completionTime)
+    {
+        var store = GameStateStore.Instance;
+        if (store == null) return;
+
+        // Mark level complete and unlock next
+        store.MarkLevelComplete(levelIndex);
+
+        // Commit session data to persistent state
+        store.CommitSessionCoins();
+        store.CommitSessionSkills();
+
+        // Reset session for next level
+        store.ResetSession();
+    }
+}

scripts/Events/LevelStateHandler.cs.uid

@@ -0,0 +1 @@
+uid://gx5vn7viphv

scripts/Events/LivesStateHandler.cs

@@ -0,0 +1,29 @@
+using Godot;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+/// <summary>
+/// Handles player death events and updates lives in GameStateStore.
+/// </summary>
+public partial class LivesStateHandler : Node
+{
+    public override void _Ready()
+    {
+        EventBus.Instance.PlayerDied += OnPlayerDied;
+    }
+
+    public override void _ExitTree()
+    {
+        if (EventBus.Instance != null)
+        {
+            EventBus.Instance.PlayerDied -= OnPlayerDied;
+        }
+    }
+
+    private void OnPlayerDied(Vector2 position)
+    {
+        GameStateStore.Instance?.RemoveLife();
+        GameStateStore.Instance?.ResetSession();
+    }
+}

scripts/Events/LivesStateHandler.cs.uid

@@ -0,0 +1 @@
+uid://b4ocg7g8vmtvp

scripts/Events/SpeedRunEventHandler.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.Events;
@@ -10,10 +11,9 @@ public partial class SpeedRunEventHandler : Node
 
     public override void _Ready()
     {
-        _speedRunManager = GetNode<SpeedRunManager>("/root/SpeedRunManager");
-        var eventBus = GetNode<EventBus>("/root/EventBus");
+        _speedRunManager = GetNode<SpeedRunManager>(Constants.SpeedRunManagerPath);
 
-        eventBus.LevelCompleted += OnLevelCompleted;
+        EventBus.Instance.LevelCompleted += OnLevelCompleted;
     }
 
     private void OnLevelCompleted(int levelIndex, Node currentScene, double completionTime)

scripts/Events/StatisticsEventHandler.cs

@@ -0,0 +1,62 @@
+using Godot;
+using Mr.BrickAdventures;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+/// <summary>
+/// Handles game events and updates statistics accordingly.
+/// Listens to EventBus signals and increments relevant stats.
+/// </summary>
+public partial class StatisticsEventHandler : Node
+{
+    private StatisticsManager _statisticsManager;
+
+    public override void _Ready()
+    {
+        _statisticsManager = GetNode<StatisticsManager>(Constants.StatisticsManagerPath);
+
+        // Subscribe to events
+        EventBus.Instance.CoinCollected += OnCoinCollected;
+        EventBus.Instance.EnemyDefeated += OnEnemyDefeated;
+        EventBus.Instance.PlayerDied += OnPlayerDied;
+        EventBus.Instance.LevelCompleted += OnLevelCompleted;
+        EventBus.Instance.ChildRescued += OnChildRescued;
+    }
+
+    public override void _ExitTree()
+    {
+        if (EventBus.Instance == null) return;
+
+        EventBus.Instance.CoinCollected -= OnCoinCollected;
+        EventBus.Instance.EnemyDefeated -= OnEnemyDefeated;
+        EventBus.Instance.PlayerDied -= OnPlayerDied;
+        EventBus.Instance.LevelCompleted -= OnLevelCompleted;
+        EventBus.Instance.ChildRescued -= OnChildRescued;
+    }
+
+    private void OnCoinCollected(int amount, Vector2 position)
+    {
+        _statisticsManager.IncrementStat("coins_collected", amount);
+    }
+
+    private void OnEnemyDefeated(Node enemy, Vector2 position)
+    {
+        _statisticsManager.IncrementStat("enemies_defeated");
+    }
+
+    private void OnPlayerDied(Vector2 position)
+    {
+        _statisticsManager.IncrementStat("deaths");
+    }
+
+    private void OnLevelCompleted(int levelIndex, Node currentScene, double completionTime)
+    {
+        _statisticsManager.IncrementStat("levels_completed");
+    }
+
+    private void OnChildRescued(Vector2 position)
+    {
+        _statisticsManager.IncrementStat("children_rescued");
+    }
+}

scripts/Events/StatisticsEventHandler.cs.uid

@@ -0,0 +1 @@
+uid://l68tjau3k6bw

scripts/State/PlayerState.cs

@@ -0,0 +1,73 @@
+using System.Collections.Generic;
+using Mr.BrickAdventures.scripts.Resources;
+
+namespace Mr.BrickAdventures.scripts.State;
+
+/// <summary>
+/// Persistent player data that survives across sessions.
+/// This is a POCO (Plain Old C# Object) for predictable state management.
+/// </summary>
+public class PlayerState
+{
+    /// <summary>
+    /// Saved coins (not including current session).
+    /// </summary>
+    public int Coins { get; set; }
+
+    /// <summary>
+    /// Remaining lives.
+    /// </summary>
+    public int Lives { get; set; } = 3;
+
+    /// <summary>
+    /// Indices of completed levels.
+    /// </summary>
+    public List<int> CompletedLevels { get; set; } = new();
+
+    /// <summary>
+    /// Indices of levels the player can access.
+    /// </summary>
+    public List<int> UnlockedLevels { get; set; } = new() { 0 };
+
+    /// <summary>
+    /// Skills the player has permanently unlocked.
+    /// </summary>
+    public List<SkillData> UnlockedSkills { get; set; } = new();
+
+    /// <summary>
+    /// Statistics dictionary for tracking game stats.
+    /// </summary>
+    public Dictionary<string, int> Statistics { get; set; } = new();
+
+    /// <summary>
+    /// IDs of unlocked achievements.
+    /// </summary>
+    public List<string> UnlockedAchievements { get; set; } = new();
+
+    /// <summary>
+    /// Creates a fresh default player state.
+    /// </summary>
+    public static PlayerState CreateDefault() => new()
+    {
+        Coins = 0,
+        Lives = 3,
+        CompletedLevels = new List<int>(),
+        UnlockedLevels = new List<int> { 0 },
+        UnlockedSkills = new List<SkillData>(),
+        Statistics = new Dictionary<string, int>()
+    };
+
+    /// <summary>
+    /// Resets this state to default values.
+    /// </summary>
+    public void Reset()
+    {
+        Coins = 0;
+        Lives = 3;
+        CompletedLevels.Clear();
+        UnlockedLevels.Clear();
+        UnlockedLevels.Add(0);
+        UnlockedSkills.Clear();
+        Statistics.Clear();
+    }
+}

scripts/State/PlayerState.cs.uid

@@ -0,0 +1 @@
+uid://gtr1e60jq7iv

scripts/State/SessionState.cs

@@ -0,0 +1,55 @@
+using System.Collections.Generic;
+using Mr.BrickAdventures.scripts.Resources;
+
+namespace Mr.BrickAdventures.scripts.State;
+
+/// <summary>
+/// Data for the current gameplay session.
+/// Reset when player dies or completes a level.
+/// </summary>
+public class SessionState
+{
+    /// <summary>
+    /// Current level index being played.
+    /// </summary>
+    public int CurrentLevel { get; set; }
+
+    /// <summary>
+    /// Coins collected during this session (not yet saved).
+    /// </summary>
+    public int CoinsCollected { get; set; }
+
+    /// <summary>
+    /// Skills unlocked during this session (not yet saved).
+    /// </summary>
+    public List<SkillData> SkillsUnlocked { get; set; } = new();
+
+    /// <summary>
+    /// Creates a fresh session state.
+    /// </summary>
+    public static SessionState CreateDefault() => new()
+    {
+        CurrentLevel = 0,
+        CoinsCollected = 0,
+        SkillsUnlocked = new List<SkillData>()
+    };
+
+    /// <summary>
+    /// Resets session state to defaults.
+    /// </summary>
+    public void Reset()
+    {
+        CoinsCollected = 0;
+        SkillsUnlocked.Clear();
+    }
+
+    /// <summary>
+    /// Resets completely including level.
+    /// </summary>
+    public void ResetAll()
+    {
+        CurrentLevel = 0;
+        CoinsCollected = 0;
+        SkillsUnlocked.Clear();
+    }
+}

scripts/State/SessionState.cs.uid

@@ -0,0 +1 @@
+uid://chqsdleqrnl7b

scripts/UI/AudioSettings.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.UI;
@@ -16,8 +17,8 @@ public partial class AudioSettings : Control
 
     public override void _Ready()
     {
-        _uiManager = GetNode<UIManager>("/root/UIManager");
-        _configFileHandler = GetNode<ConfigFileHandler>("/root/ConfigFileHandler");
+        _uiManager = GetNode<UIManager>(Constants.UIManagerPath);
+        _configFileHandler = GetNode<ConfigFileHandler>(Constants.ConfigFileHandlerPath);
         Initialize();
         MasterVolumeSlider.ValueChanged += OnMasterVolumeChanged;
         MusicVolumeSlider.ValueChanged += OnMusicVolumeChanged;

scripts/UI/ChargeProgressBar.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.components;
 using Mr.BrickAdventures.scripts.Resources;
@@ -17,7 +18,7 @@ public partial class ChargeProgressBar : ProgressBar
     {
         ProgressBar.Hide();
 
-        _skillManager = GetNodeOrNull<SkillManager>("/root/SkillManager");
+        _skillManager = GetNodeOrNull<SkillManager>(Constants.SkillManagerPath);
         if (_skillManager == null)
         {
             GD.PrintErr("ChargeProgressBar: SkillManager autoload not found.");

scripts/UI/Credits.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.UI;
@@ -9,7 +10,7 @@ public partial class Credits : Control
 
     public override void _Ready()
     {
-        _uiManager = GetNode<UIManager>("/root/UIManager");
+        _uiManager = GetNode<UIManager>(Constants.UIManagerPath);
     }
 
     public override void _UnhandledInput(InputEvent @event)

scripts/UI/DeathScreen.cs

@@ -1,6 +1,8 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.Resources;
+using Mr.BrickAdventures.scripts.State;
 
 namespace Mr.BrickAdventures.scripts.UI;
 
@@ -18,19 +20,36 @@ public partial class DeathScreen : Control
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        SetLabels();
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+
+        // Subscribe to lives changed event for reactive updates
+        EventBus.Instance.LivesChanged += OnLivesChanged;
+    }
+
+    public override void _ExitTree()
+    {
+        if (EventBus.Instance != null)
+        {
+            EventBus.Instance.LivesChanged -= OnLivesChanged;
+        }
+    }
+
+    private void OnLivesChanged(int lives)
+    {
+        // Update the label when lives change
+        LivesLeftLabel.Text = $" x {lives}";
     }
 
     private void SetLabels()
     {
-        if (_gameManager == null) return;
-        
         if (CurrentLevel != null)
         {
             CurrentLevelLabel.Text = CurrentLevel.LevelName;
         }
-        LivesLeftLabel.Text = $" x {_gameManager.GetLives()}";
+
+        // Read current lives from store
+        var lives = GameStateStore.Instance?.Player.Lives ?? 0;
+        LivesLeftLabel.Text = $" x {lives}";
     }
 
     private void SetupTimer()
@@ -65,7 +84,8 @@ public partial class DeathScreen : Control
 
     private void OnTimeout()
     {
-        if (_gameManager == null || _gameManager.GetLives() == 0) return;
+        var lives = GameStateStore.Instance?.Player.Lives ?? 0;
+        if (lives == 0) return;
 
         GetTree().ReloadCurrentScene();
     }

scripts/UI/GameOverScreen.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.UI;
@@ -14,7 +15,7 @@ public partial class GameOverScreen : Control
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
         RestartButton.Pressed += OnRestartClicked;
         MainMenuButton.Pressed += OnMainMenuClicked;
     }

scripts/UI/Hud.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.components;
 
@@ -15,7 +16,7 @@ public partial class Hud : Control
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
     }
 
     public override void _Process(double delta)

scripts/UI/MainMenu.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.UI;
@@ -21,9 +22,9 @@ public partial class MainMenu : Control
 
     public override void _Ready()
     {
-        _saveSystem = GetNode<SaveSystem>("/root/SaveSystem");
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        _uiManager = GetNode<UIManager>("/root/UIManager");
+        _saveSystem = GetNode<SaveSystem>(Constants.SaveSystemPath);
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+        _uiManager = GetNode<UIManager>(Constants.UIManagerPath);
 
         NewGameButton.Pressed += OnNewGamePressed;
         ContinueButton.Pressed += OnContinuePressed;

scripts/UI/Marketplace.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using Godot;
 using Godot.Collections;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.components;
 using Mr.BrickAdventures.scripts.Resources;
@@ -25,8 +26,8 @@ public partial class Marketplace : Control
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        _skillManager = GetNode<SkillManager>("/root/SkillManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+        _skillManager = GetNode<SkillManager>(Constants.SkillManagerPath);
         _skillManager.SkillRemoved += OnSkillRemoved;
 
         Skills = _skillManager.AvailableSkills;

scripts/UI/MarketplaceButton.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.components;
 using Mr.BrickAdventures.scripts.Resources;
@@ -18,7 +19,7 @@ public partial class MarketplaceButton : Button
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
         var player = _gameManager.Player;
         if (player == null) return;
 
@@ -28,7 +29,7 @@ public partial class MarketplaceButton : Button
             _skillUnlockerComponent.SkillUnlocked += OnSkillStateChanged;
         }
 
-        _skillManager = GetNode<SkillManager>("/root/SkillManager");
+        _skillManager = GetNode<SkillManager>(Constants.SkillManagerPath);
         _skillManager.SkillRemoved += OnSkillStateChanged;
 
         UpdateButtonState();

scripts/UI/PauseMenu.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.UI;
@@ -18,8 +19,8 @@ public partial class PauseMenu : Control
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        _uiManager = GetNode<UIManager>("/root/UIManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+        _uiManager = GetNode<UIManager>(Constants.UIManagerPath);
 
         ResumeButton.Pressed += OnResumePressed;
         MainMenuButton.Pressed += OnMainMenuPressed;

scripts/UI/SettingsMenu.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.UI;
@@ -19,7 +20,7 @@ public partial class SettingsMenu : Control
 
     public override void _Ready()
     {
-        _uiManager = GetNode<UIManager>("/root/UIManager");
+        _uiManager = GetNode<UIManager>(Constants.UIManagerPath);
 
         InputSettingsButton.Pressed += OnInputSettingsPressed;
         AudioSettingsButton.Pressed += OnAudioSettingsPressed;

scripts/UI/SpeedRunHud.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.UI;
@@ -12,7 +13,7 @@ public partial class SpeedRunHud : Control
 
     public override void _Ready()
     {
-        _speedRunManager = GetNode<SpeedRunManager>("/root/SpeedRunManager");
+        _speedRunManager = GetNode<SpeedRunManager>(Constants.SpeedRunManagerPath);
 
         _speedRunManager.TimeUpdated += OnTimerUpdated;
 

scripts/components/BrickShieldSkillComponent.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.interfaces;
 using Mr.BrickAdventures.scripts.Resources;
@@ -19,8 +20,8 @@ public partial class BrickShieldSkillComponent : Node, ISkill
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        _skillManager = GetNode<SkillManager>("/root/SkillManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+        _skillManager = GetNode<SkillManager>(Constants.SkillManagerPath);
     }
 
     public void Initialize(Node owner, SkillData data)

scripts/components/CollectableComponent.cs

@@ -1,5 +1,6 @@
 using System;
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.Resources;
 
@@ -35,7 +36,7 @@ public partial class CollectableComponent : Node
         if (Owner.HasNode("FadeAwayComponent"))
             _hasFadeAway = true;
 
-        _floatingTextManager = GetNode<FloatingTextManager>("/root/FloatingTextManager");
+        _floatingTextManager = GetNode<FloatingTextManager>(Constants.FloatingTextManagerPath);
     }
 
     private async void OnArea2DBodyEntered(Node2D body)
@@ -53,12 +54,18 @@ public partial class CollectableComponent : Node
                 {
                     case CollectableType.Coin:
                         _floatingTextManager?.ShowCoin((int)Data.Amount, ownerNode.GlobalPosition);
+                        EventBus.EmitCoinCollected((int)Data.Amount, ownerNode.GlobalPosition);
                         break;
                     case CollectableType.Health:
                         _floatingTextManager?.ShowMessage("Healed!", ownerNode.GlobalPosition);
+                        EventBus.EmitItemCollected(Data.Type, Data.Amount, ownerNode.GlobalPosition);
                         break;
                     case CollectableType.Kid:
                         _floatingTextManager?.ShowMessage("Rescued!", ownerNode.GlobalPosition);
+                        EventBus.EmitChildRescued(ownerNode.GlobalPosition);
+                        break;
+                    default:
+                        EventBus.EmitItemCollected(Data.Type, Data.Amount, ownerNode.GlobalPosition);
                         break;
                 }
             }

scripts/components/EnemyDeathComponent.cs

@@ -1,5 +1,6 @@
 using System.Threading.Tasks;
 using Godot;
+using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.components;
 
@@ -34,6 +35,12 @@ public partial class EnemyDeathComponent : Node
 
     private async Task Die()
     {
+        // Emit enemy defeated event for statistics and other systems
+        if (Owner is Node2D ownerNode)
+        {
+            EventBus.EmitEnemyDefeated(Owner, ownerNode.GlobalPosition);
+        }
+
         CollisionShape.SetDisabled(true);
         var tween = CreateTween();
         tween.TweenProperty(Owner, "scale", Vector2.Zero, TweenDuration);

scripts/components/ExitDoorComponent.cs

@@ -1,6 +1,8 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.interfaces;
+using Mr.BrickAdventures.scripts.State;
 
 namespace Mr.BrickAdventures.scripts.components;
 
@@ -20,8 +22,8 @@ public partial class ExitDoorComponent : Area2D, IUnlockable
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        _achievementManager = GetNode<AchievementManager>("/root/AchievementManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+        _achievementManager = GetNode<AchievementManager>(Constants.AchievementManagerPath);
 
         BodyEntered += OnExitAreaBodyEntered;
 
@@ -33,7 +35,9 @@ public partial class ExitDoorComponent : Area2D, IUnlockable
 
         EmitSignalExitTriggered();
         _achievementManager.UnlockAchievement(AchievementId);
-        _gameManager.UnlockLevel((int)_gameManager.PlayerState["current_level"] + 1);
+        // Get current level from GameStateStore
+        var currentLevel = GameStateStore.Instance?.Session.CurrentLevel ?? 0;
+        _gameManager.UnlockLevel(currentLevel + 1);
         CallDeferred(nameof(GoToNextLevel));
     }
 

scripts/components/HealthComponent.cs

@@ -1,5 +1,6 @@
 using System.Threading.Tasks;
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.components;
@@ -19,7 +20,7 @@ public partial class HealthComponent : Node2D
 
     public override void _Ready()
     {
-        _floatingTextManager = GetNode<FloatingTextManager>("/root/FloatingTextManager");
+        _floatingTextManager = GetNode<FloatingTextManager>(Constants.FloatingTextManagerPath);
     }
 
     public void SetHealth(float newValue)
@@ -70,10 +71,21 @@ public partial class HealthComponent : Node2D
         if (Health <= 0f)
         {
             EmitSignalDeath();
+            // Emit global event if this is the player
+            if (Owner is PlayerController)
+                EventBus.EmitPlayerDied(GlobalPosition);
         }
         else
         {
             EmitSignalHealthChanged(delta, Health);
+            // Emit global events if this is the player
+            if (Owner is PlayerController)
+            {
+                if (delta < 0f)
+                    EventBus.EmitPlayerDamaged(Mathf.Abs(delta), Health, GlobalPosition);
+                else
+                    EventBus.EmitPlayerHealed(delta, Health, GlobalPosition);
+            }
         }
     }
 }

scripts/components/LeverComponent.cs

@@ -1,5 +1,6 @@
 using System.Threading.Tasks;
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.components;
@@ -20,7 +21,7 @@ public partial class LeverComponent : Node
 
     public override void _Ready()
     {
-        _floatingTextManager = GetNode<FloatingTextManager>("/root/FloatingTextManager");
+        _floatingTextManager = GetNode<FloatingTextManager>(Constants.FloatingTextManagerPath);
 
         if (Area == null)
         {

scripts/components/PlayerController.cs

@@ -2,6 +2,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.components;
@@ -33,7 +34,7 @@ public partial class PlayerController : CharacterBody2D
 
     public override void _Ready()
     {
-        var skillManager = GetNodeOrNull<SkillManager>("/root/SkillManager");
+        var skillManager = GetNodeOrNull<SkillManager>(Constants.SkillManagerPath);
         skillManager?.RegisterPlayer(this);
 
         _inputHandler = GetNode<PlayerInputHandler>("PlayerInputHandler");

scripts/components/PlayerDeathComponent.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 
 namespace Mr.BrickAdventures.scripts.components;
@@ -15,7 +16,7 @@ public partial class PlayerDeathComponent : Node2D
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
         HealthComponent.Death += OnDeath;
     }
 
@@ -31,7 +32,7 @@ public partial class PlayerDeathComponent : Node2D
             effect.Scale = EffectScale;
         }
 
-        _gameManager.RemoveLives(1);
-        _gameManager.ResetCurrentSessionState();
+        // Lives are now decremented by LivesStateHandler via PlayerDied event
+        // Session state is reset by LivesStateHandler as well
     }
 }

scripts/components/ScoreComponent.cs

@@ -1,43 +0,0 @@
-using Godot;
-using Mr.BrickAdventures.Autoloads;
-using Mr.BrickAdventures.scripts.Resources;
-
-namespace Mr.BrickAdventures.scripts.components;
-
-[GlobalClass]
-public partial class ScoreComponent : Node
-{
-    private GameManager _gameManager;
-    private const string CoinsGroupName = "coins";
-    
-    public override async void _Ready()
-    {
-        await ToSignal(GetTree(), SceneTree.SignalName.ProcessFrame);
-        
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        if (_gameManager == null)
-        {
-            GD.PrintErr("GameManager not found in the scene tree.");
-            return;
-        }
-
-        var coins = GetTree().GetNodesInGroup(CoinsGroupName);
-        foreach (var coin in coins)
-        {
-            var c = coin.GetNodeOrNull<CollectableComponent>("CollectableComponent");
-            if (c != null)
-            {
-                c.Collected += OnCollected;
-            }
-        }
-    }
-    
-    private void OnCollected(float amount, CollectableType type, Node2D body)
-    {
-        if (type != CollectableType.Coin) return;
-        
-        var coinAmount = (int)amount;
-        var currentCoins = (int)_gameManager.CurrentSessionState["coins_collected"];
-        _gameManager.CurrentSessionState["coins_collected"] = currentCoins + coinAmount;
-    }
-}

scripts/components/ScoreComponent.cs.uid

@@ -1 +0,0 @@
-uid://ccqb8kd5m0eh7

scripts/components/SkillUnlockerComponent.cs

@@ -1,8 +1,10 @@
 using Godot;
 using Godot.Collections;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.interfaces;
 using Mr.BrickAdventures.scripts.Resources;
+using Mr.BrickAdventures.scripts.State;
 
 namespace Mr.BrickAdventures.scripts.components;
 
@@ -18,8 +20,8 @@ public partial class SkillUnlockerComponent : Node
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        SkillManager = GetNode<SkillManager>("/root/SkillManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+        SkillManager = GetNode<SkillManager>(Constants.SkillManagerPath);
     }
 
     private bool HasEnoughCoins(int amount)
@@ -37,8 +39,8 @@ public partial class SkillUnlockerComponent : Node
         skill.IsActive = true;
         _gameManager.RemoveCoins(skill.Upgrades[0].Cost);
 
-        var skillsUnlocked = (Array<SkillData>)_gameManager.CurrentSessionState["skills_unlocked"];
-        skillsUnlocked.Add(skill);
+        // Add to session state via GameStateStore
+        GameStateStore.Instance?.UnlockSkillInSession(skill);
         SkillManager.AddSkill(skill);
         EmitSignalSkillUnlocked(skill);