diff --git a/core/game_overlay_integration.py b/core/game_overlay_integration.py
new file mode 100644
index 0000000..206c34c
--- /dev/null
+++ b/core/game_overlay_integration.py
@@ -0,0 +1,256 @@
+"""
+EU-Utility - Game Overlay Integration
+
+Attaches the Activity Bar directly to the EU game window as a child window.
+This makes the overlay "burned into" the game - it moves and resizes with the game window.
+"""
+
+import sys
+from typing import Optional
+from PyQt6.QtCore import QTimer, QObject, pyqtSignal
+from PyQt6.QtWidgets import QApplication
+
+try:
+    import ctypes
+    from ctypes import wintypes
+    WINDOWS_AVAILABLE = True
+except ImportError:
+    WINDOWS_AVAILABLE = False
+
+
+class GameOverlayIntegration(QObject):
+    """
+    Integrates the Activity Bar with the EU game window.
+    
+    Features:
+    - Detects game by process name (not just window title)
+    - Attaches overlay as child window (moves with game)
+    - Hides/shows based on game process running
+    """
+    
+    game_started = pyqtSignal()
+    game_stopped = pyqtSignal()
+    
+    def __init__(self, activity_bar, parent=None):
+        super().__init__(parent)
+        self.activity_bar = activity_bar
+        self._game_window = None
+        self._game_process_id = None
+        self._is_attached = False
+        
+        # EU process names
+        self.EU_PROCESSES = ["entropia.exe", "entropiauniverse.exe"]
+        
+        # Timer to check game status
+        self._check_timer = QTimer(self)
+        self._check_timer.timeout.connect(self._check_game_status)
+        self._check_timer.start(2000)  # Check every 2 seconds
+        
+        if WINDOWS_AVAILABLE:
+            self.user32 = ctypes.windll.user32
+            self.kernel32 = ctypes.windll.kernel32
+    
+    def _check_game_status(self):
+        """Check if game process is running and manage overlay."""
+        if not WINDOWS_AVAILABLE:
+            return
+        
+        try:
+            # Find game process
+            game_pid = self._find_game_process()
+            
+            if game_pid and not self._game_process_id:
+                # Game just started
+                print(f"[GameOverlay] EU process detected (PID: {game_pid})")
+                self._game_process_id = game_pid
+                self._attach_to_game()
+                self.game_started.emit()
+                
+            elif not game_pid and self._game_process_id:
+                # Game just stopped
+                print("[GameOverlay] EU process ended")
+                self._detach_from_game()
+                self._game_process_id = None
+                self.game_stopped.emit()
+                
+            elif game_pid and self._game_process_id:
+                # Game still running - update position if attached
+                if self._is_attached:
+                    self._update_overlay_position()
+                    
+        except Exception as e:
+            print(f"[GameOverlay] Error checking game: {e}")
+    
+    def _find_game_process(self) -> Optional[int]:
+        """Find EU game process by name."""
+        if not WINDOWS_AVAILABLE:
+            return None
+        
+        try:
+            # Use tasklist to find process
+            import subprocess
+            result = subprocess.run(
+                ['tasklist', '/FO', 'CSV', '/NH'],
+                capture_output=True,
+                text=True,
+                timeout=5
+            )
+            
+            if result.returncode == 0:
+                for line in result.stdout.split('\n'):
+                    for proc_name in self.EU_PROCESSES:
+                        if proc_name.lower() in line.lower():
+                            # Extract PID from CSV
+                            parts = line.split('","')
+                            if len(parts) >= 2:
+                                try:
+                                    pid = int(parts[1])
+                                    return pid
+                                except ValueError:
+                                    continue
+        except Exception as e:
+            print(f"[GameOverlay] Error finding process: {e}")
+        
+        return None
+    
+    def _attach_to_game(self):
+        """Attach overlay to game window."""
+        if not self.activity_bar or not WINDOWS_AVAILABLE:
+            return
+        
+        try:
+            # Find game window
+            self._game_window = self._find_game_window()
+            
+            if self._game_window:
+                # Set activity bar as child of game window
+                # This makes it move with the game window
+                self._set_window_parent(self.activity_bar.winId(), self._game_window)
+                self._is_attached = True
+                print("[GameOverlay] Attached to game window")
+                
+                # Show the overlay
+                self.activity_bar.show()
+            else:
+                print("[GameOverlay] Game process found but window not found yet")
+                
+        except Exception as e:
+            print(f"[GameOverlay] Error attaching: {e}")
+    
+    def _detach_from_game(self):
+        """Detach overlay from game window."""
+        if not self.activity_bar or not WINDOWS_AVAILABLE:
+            return
+        
+        try:
+            if self._is_attached:
+                # Remove parent (make top-level again)
+                self._set_window_parent(self.activity_bar.winId(), 0)
+                self._is_attached = False
+                print("[GameOverlay] Detached from game window")
+            
+            # Hide overlay
+            self.activity_bar.hide()
+            self._game_window = None
+            
+        except Exception as e:
+            print(f"[GameOverlay] Error detaching: {e}")
+    
+    def _find_game_window(self) -> Optional[int]:
+        """Find game window by process ID."""
+        if not WINDOWS_AVAILABLE or not self._game_process_id:
+            return None
+        
+        found_hwnd = [None]
+        
+        def callback(hwnd, extra):
+            if not self.user32.IsWindowVisible(hwnd):
+                return True
+            
+            # Get process ID for this window
+            pid = wintypes.DWORD()
+            self.user32.GetWindowThreadProcessId(hwnd, ctypes.byref(pid))
+            
+            if pid.value == self._game_process_id:
+                # Check if it's the main game window (has a title)
+                text = ctypes.create_unicode_buffer(256)
+                self.user32.GetWindowTextW(hwnd, text, 256)
+                if text.value and "Entropia" in text.value:
+                    found_hwnd[0] = hwnd
+                    return False  # Stop enumeration
+            
+            return True
+        
+        # EnumWindows callback type
+        EnumWindowsProc = ctypes.WINFUNCTYPE(
+            wintypes.BOOL,
+            wintypes.HWND,
+            wintypes.LPARAM
+        )
+        
+        proc = EnumWindowsProc(callback)
+        self.user32.EnumWindows(proc, 0)
+        
+        return found_hwnd[0]
+    
+    def _set_window_parent(self, child_hwnd: int, parent_hwnd: int):
+        """Set window parent using SetParent API."""
+        if not WINDOWS_AVAILABLE:
+            return
+        
+        # WS_CHILD style
+        WS_CHILD = 0x40000000
+        WS_POPUP = 0x80000000
+        
+        # Get current style
+        GWL_STYLE = -16
+        current_style = self.user32.GetWindowLongW(child_hwnd, GWL_STYLE)
+        
+        if parent_hwnd:
+            # Make it a child window
+            new_style = (current_style | WS_CHILD) & ~WS_POPUP
+            self.user32.SetWindowLongW(child_hwnd, GWL_STYLE, new_style)
+            self.user32.SetParent(child_hwnd, parent_hwnd)
+        else:
+            # Make it a top-level window again
+            new_style = (current_style | WS_POPUP) & ~WS_CHILD
+            self.user32.SetWindowLongW(child_hwnd, GWL_STYLE, new_style)
+            self.user32.SetParent(child_hwnd, 0)
+    
+    def _update_overlay_position(self):
+        """Update overlay position to match game window."""
+        if not self._is_attached or not self._game_window or not WINDOWS_AVAILABLE:
+            return
+        
+        try:
+            # Get game window rect
+            rect = wintypes.RECT()
+            if self.user32.GetWindowRect(self._game_window, ctypes.byref(rect)):
+                # Position activity bar at bottom of game window
+                width = rect.right - rect.left
+                height = 56  # Activity bar height
+                
+                x = rect.left + (width - self.activity_bar.width()) // 2
+                y = rect.bottom - height - 10  # 10px margin from bottom
+                
+                self.activity_bar.move(x, y)
+        except Exception as e:
+            pass  # Ignore errors during position update
+    
+    def stop(self):
+        """Stop the overlay integration."""
+        self._check_timer.stop()
+        self._detach_from_game()
+
+
+# Singleton instance
+_overlay_integration = None
+
+def get_game_overlay_integration(activity_bar=None, parent=None):
+    """Get or create the game overlay integration."""
+    global _overlay_integration
+    if _overlay_integration is None:
+        if activity_bar is None:
+            raise ValueError("activity_bar required for first initialization")
+        _overlay_integration = GameOverlayIntegration(activity_bar, parent)
+    return _overlay_integration
diff --git a/core/main.py b/core/main.py
index be570c7..88c379a 100644
--- a/core/main.py
+++ b/core/main.py
@@ -184,6 +184,14 @@ class EUUtilityApp:
                     parent=self.app  # Pass QApplication as parent
                 )
                 
+                # Start game overlay integration (process-based detection + window attachment)
+                from core.game_overlay_integration import get_game_overlay_integration
+                self.game_overlay = get_game_overlay_integration(self.activity_bar, parent=self.app)
+                
+                # Connect signals
+                self.game_overlay.game_started.connect(lambda: print("[Main] Game detected - overlay attached"))
+                self.game_overlay.game_stopped.connect(lambda: print("[Main] Game ended - overlay detached"))
+                
                 # Set mode from settings (default: game focused - Blish HUD style)
                 settings = get_settings()
                 mode_str = settings.get('activity_bar.overlay_mode', 'overlay_game')
@@ -521,6 +529,11 @@ class EUUtilityApp:
         """Quit the application."""
         print("[Core] Shutting down...")
         
+        # Stop game overlay integration
+        if hasattr(self, 'game_overlay') and self.game_overlay:
+            print("[Core] Stopping Game Overlay Integration...")
+            self.game_overlay.stop()
+        
         # Stop overlay controller
         if hasattr(self, 'overlay_controller') and self.overlay_controller:
             print("[Core] Stopping Overlay Controller...")