===================================================================
--- original.js
+++ change.js
@@ -101,12 +101,15 @@
 // Initialize player
 var player = game.addChild(new Player());
 player.x = 1024;
 player.y = 2500;
-// Initialize wall
-var wall = game.addChild(new Wall());
-wall.x = 1024;
-wall.y = 1500;
+// Initialize walls on the sides
+var leftWall = game.addChild(new Wall());
+leftWall.x = 0;
+leftWall.y = 1366;
+var rightWall = game.addChild(new Wall());
+rightWall.x = 2048;
+rightWall.y = 1366;
 // Initialize ground
 var ground = game.addChild(new Ground());
 ground.x = 1024;
 ground.y = 2732 - ground.height / 2;
@@ -132,10 +135,10 @@
 // Game update loop
 game.update = function () {
 	// Update player
 	player.update();
-	// Check for collision between player and wall
-	if (player.intersects(wall)) {
+	// Check for collision between player and the walls
+	if (player.intersects(leftWall) || player.intersects(rightWall)) {
 		LK.effects.flashScreen(0xff0000, 1000);
 		LK.showGameOver();
 	}
 	// Make the screen follow the player