===================================================================
--- original.js
+++ change.js
@@ -16,15 +16,25 @@
 	self.velocityY = 0;
 	self.rotationAngle = 0; // Rotation angle of the ball
 	// Ball update method
 	self.update = function () {
+		// Apply gravity
 		self.velocityY += self.gravity;
 		self.y += self.velocityY;
-		// Bounce off the bottom of the screen
-		if (self.y + self.radius > 2732) {
-			self.y = 2732 - self.radius;
-			self.velocityY *= self.bounce;
+		// Check if the ball is on the platform
+		if (self.y + self.radius > platform.y - platform.height / 2) {
+			// Reset the ball's vertical position and velocity
+			self.y = platform.y - platform.height / 2 - self.radius;
+			self.velocityY = 0;
+			// Calculate the displacement of the ball from the center of the platform
+			var displacement = self.x - platform.x;
+			// If the ball is not perfectly centered, it should roll off the platform
+			self.velocityX = displacement * 0.05; // The constant 0.05 determines the speed of rolling
 		}
+		// Apply horizontal velocity
+		self.x += self.velocityX;
+		// Apply friction to gradually stop the ball from rolling
+		self.velocityX *= 0.95;
 	};
 });
 // Platform class
 var Platform = Container.expand(function () {