diff --git a/frontend/static/js/api/Matchmaking.js b/frontend/static/js/api/Matchmaking.js
index 1bbec59..7081c5e 100644
--- a/frontend/static/js/api/Matchmaking.js
+++ b/frontend/static/js/api/Matchmaking.js
@@ -27,6 +27,7 @@ class MatchMaking
 			return null;
 		
 		this.gamemode = gamemode
+
 		let url = `${window.location.protocol[4] === 's' ? 'wss' : 'ws'}://${window.location.host}/ws/matchmaking/${mode}`;
 
 		this._socket = new WebSocket(url);
diff --git a/frontend/static/js/api/game/TicTacToeGame.js b/frontend/static/js/api/game/TicTacToeGame.js
index 871a465..08ddb78 100644
--- a/frontend/static/js/api/game/TicTacToeGame.js
+++ b/frontend/static/js/api/game/TicTacToeGame.js
@@ -19,16 +19,36 @@ class TicTacToe
 
 	init()
 	{
-		this.canvas.addEventListener("mousedown", (event) => { this.onClick(event) }, false);
+		this.canvas.addEventListener("mousedown", (event, morpion = this) => this.onClick(event, morpion));
 	}
 
 	uninit()
 	{
-		this.canvas.removeEventListener("mousedown", this.onClick, false);
+		this.canvas.addEventListener("mousedown", (event, morpion = this) => this.onClick(event, morpion));
 	}
 
-	onClick(event)
+	onClick(event, morpion)
 	{
+		let x = event.offsetX;
+		let y = event.offsetY;
+		let targetMorpion, targetCase;
+
+		function checkCase(targetMorpion, targetCase)
+		{
+			console.log("TargetMorpion :" + targetMorpion + " targetCase :" + targetCase);
+			return (morpion.game[targetMorpion][targetCase] == -1);
+		}
+
+		function incorrectCase()
+		{
+			console.log("bozo");
+		}
+
+		function sendCase(targetMorpion, targetCase)
+		{
+			// send to backend (stp camille code bien)
+		}
+
 		function findPlace(x, morpion)
 		{	
 			if (x <= morpion.gap || x >= morpion.gap + morpion.rectsize * 9)
@@ -53,22 +73,15 @@ class TicTacToe
 			return -1;
 		}
 
-		let x = event.offsetX;
-		let y = event.offsetY;
-		let targetMorpion, targetCase;
-
 		targetMorpion = findPlace(x, this) + findPlace(y, this) * 3;
 		if (findPlace(x, this) < 0 || findPlace(y, this) < 0)
 			return -1;
 		targetCase = findSquare(x, this.rectsize * 3 * findPlace(x, this) + this.gap, this) + findSquare(y, this.rectsize * 3 * findPlace(y, this) + this.gap, this) * 3;
-		console.log("TargetMorpion :" + targetMorpion + " targetCase :" + targetCase);
-
-		
-		// if (sendCase(targetCase, targetMorpion)) // si la case est disponible
-			// putCase(targetCase, targetMorpion); // print the case
-		// else
-			// return ;
 
+		if (checkCase(targetMorpion, targetCase))
+			sendCase(targetMorpion, targetCase);
+		else
+			incorrectCase();
 	}
 
     DrawSuperMorpion()
diff --git a/frontend/static/js/api/game/sounds/incorrectbuzzer.mp3 b/frontend/static/js/api/game/sounds/incorrectbuzzer.mp3
new file mode 100644
index 0000000..3df61fd
Binary files /dev/null and b/frontend/static/js/api/game/sounds/incorrectbuzzer.mp3 differ