===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,26 @@
 /**** 
 * Classes
 ****/ 
+// LongObstacle class representing long obstacles in the game
+var LongObstacle = Container.expand(function () {
+	var self = Container.call(this);
+	var obstacleGraphics = self.attachAsset('obstacle', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		scaleX: 2.5,
+		scaleY: 20.0 // Longer height for the obstacle
+	});
+	self.speedX = -5;
+	// Update function for obstacle movement
+	self.update = function () {
+		self.x += self.speedX;
+		// Remove obstacle if it goes off screen
+		if (self.x < -obstacleGraphics.width / 2) {
+			self.destroy();
+		}
+	};
+});
 //<Assets used in the game will automatically appear here>
 // Player class representing the main character
 var Player = Container.expand(function () {
 	var self = Container.call(this);
@@ -47,8 +66,27 @@
 			self.destroy();
 		}
 	};
 });
+// ShortObstacle class representing short obstacles in the game
+var ShortObstacle = Container.expand(function () {
+	var self = Container.call(this);
+	var obstacleGraphics = self.attachAsset('obstacle', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		scaleX: 2.5,
+		scaleY: 5.0 // Shorter height for the obstacle
+	});
+	self.speedX = -5;
+	// Update function for obstacle movement
+	self.update = function () {
+		self.x += self.speedX;
+		// Remove obstacle if it goes off screen
+		if (self.x < -obstacleGraphics.width / 2) {
+			self.destroy();
+		}
+	};
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -69,13 +107,18 @@
 // Array to keep track of poles
 var poles = [];
 // Function to spawn poles
 function spawnPole() {
-	var pole = new Pole();
-	pole.x = 2048 + pole.width / 2;
-	pole.y = 2732 - pole.height / 2;
-	poles.push(pole);
-	game.addChild(pole);
+	var obstacle;
+	if (Math.random() > 0.5) {
+		obstacle = new ShortObstacle();
+	} else {
+		obstacle = new LongObstacle();
+	}
+	obstacle.x = 2048 + obstacle.width / 2;
+	obstacle.y = 2732 - obstacle.height / 2;
+	poles.push(obstacle);
+	game.addChild(obstacle);
 }
 // Set interval to spawn poles periodically
 var poleInterval = LK.setInterval(spawnPole, 2000);
 // Initialize score