===================================================================
--- original.js
+++ change.js
@@ -25,23 +25,23 @@
 });
 // Obstacle class representing the pipes
 var Obstacle = Container.expand(function () {
 	var self = Container.call(this);
-	var topPipe = self.attachAsset('pipe', {
+	var topWall = self.attachAsset('wall', {
 		anchorX: 0.5,
 		anchorY: 1
 	});
-	var bottomPipe = self.attachAsset('pipe', {
+	var bottomWall = self.attachAsset('wall', {
 		anchorX: 0.5,
 		anchorY: 0
 	});
 	self.speed = -5;
 	self.gap = 400;
 	// Randomize the gap position
 	self.randomizePosition = function () {
 		var gapPosition = Math.random() * (2048 - self.gap - 200) + 100;
-		topPipe.y = gapPosition - self.gap / 2;
-		bottomPipe.y = gapPosition + self.gap / 2;
+		topWall.y = gapPosition - self.gap / 2;
+		bottomWall.y = gapPosition + self.gap / 2;
 	};
 	// Update method for obstacle movement
 	self.update = function () {
 		self.x += self.speed;