diff --git a/game.js b/game.js
index bae3212..421a6a6 100644
--- a/game.js
+++ b/game.js
@@ -248,7 +248,8 @@ class Connect5Game {
 }
 
 // Initialize game when DOM is loaded
-let game;
+// Initialize game when DOM is loaded
+window.game = null;
 document.addEventListener("DOMContentLoaded", () => {
-  game = new Connect5Game();
+  window.game = new Connect5Game();
 });
diff --git a/index.html b/index.html
index 5a0b369..9fb7b7a 100644
--- a/index.html
+++ b/index.html
@@ -203,8 +203,8 @@
           statusMessage.style.display = 'block';
 
           // Reset to local mode
-          if (multiplayerClient) {
-            multiplayerClient.isMultiplayer = false;
+          if (window.multiplayerClient) {
+            window.multiplayerClient.isMultiplayer = false;
           }
         } else {
           localBtn.classList.remove('active');
@@ -215,9 +215,13 @@
           statusMessage.style.display = 'none';
 
           // Initialize multiplayer if not already
-          if (!multiplayerClient) {
-            multiplayerClient = new MultiplayerClient(game);
-            multiplayerClient.connect();
+          if (!window.multiplayerClient) {
+            if (!window.game) {
+                console.error("Game instance not found!");
+                return;
+            }
+            window.multiplayerClient = new MultiplayerClient(window.game);
+            window.multiplayerClient.connect();
           }
         }
       }
@@ -247,7 +251,14 @@
         }
 
         error.style.display = 'none';
-        multiplayerClient.registerPlayer(username);
+        
+        if (window.multiplayerClient) {
+            window.multiplayerClient.registerPlayer(username);
+        } else {
+            console.error("Multiplayer client not initialized");
+            error.textContent = "Error: Multiplayer not initialized. Refresh page.";
+            error.style.display = 'block';
+        }
       }
 
       // Change username
diff --git a/multiplayer.js b/multiplayer.js
index bf61134..993afb7 100644
--- a/multiplayer.js
+++ b/multiplayer.js
@@ -507,4 +507,5 @@ class MultiplayerClient {
 }
 
 // Initialize multiplayer client (will be used by game.js)
-let multiplayerClient = null;
+// Initialize multiplayer client (will be used by game.js)
+window.multiplayerClient = null;