===================================================================
--- original.js
+++ change.js
@@ -27,20 +27,15 @@
 				self.speedX *= -1;
 				score -= 1; // Deduct points when hitting horizontal boundaries
 				scoreTxt.setText(score.toString()); // Update score display
 			}
-			if (self.y <= 0) {
+			// Check for collision with top and bottom walls instead of using fixed game boundaries
+			if (self.intersects(topWall) || self.intersects(bottomWall)) {
 				self.speedY *= -1;
-				score -= 1; // Deduct points when hitting the top boundary
+				score -= 1; // Deduct points when hitting walls
 				scoreTxt.setText(score.toString()); // Update score display
-			}
-			// Allow the ball to fall off the bottom without reversing speed or losing points
-			// If the ball touches the bottom boundary and score is 0, trigger game over
-			if (self.y >= game.height) {
-				if (score <= 0) {
-					LK.showGameOver();
-				} else {
-					self.speedY *= -1;
+				if (self.intersects(bottomWall) && score <= 0) {
+					LK.showGameOver(); // Trigger game over if score is 0 and ball touches bottom wall
 				}
 			}
 		}
 	};
@@ -71,8 +66,19 @@
 		self.x = x;
 		self.y = y;
 	};
 });
+// Wall class for handling game boundaries
+var Wall = Container.expand(function () {
+	var self = Container.call(this);
+	// Create an invisible boundary for collision detection
+	self.width = game.width;
+	self.height = 20; // Arbitrary height for the top and bottom walls
+	self.setPosition = function (x, y) {
+		self.x = x;
+		self.y = y;
+	};
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -88,8 +94,12 @@
 	x: 0,
 	y: 0
 });
 game.addChild(background);
+var topWall = game.addChild(new Wall());
+topWall.setPosition(0, 0); // Position the top wall at the top edge of the game
+var bottomWall = game.addChild(new Wall());
+bottomWall.setPosition(0, game.height - 20); // Position the bottom wall at the bottom edge of the game
 var ball = game.addChild(new Ball());
 var butter = game.addChild(new Butter());
 butter.x = Math.random() * game.width;
 butter.y = Math.random() * game.height;