===================================================================
--- original.js
+++ change.js
@@ -42,32 +42,36 @@
 		// Top boundary
 		if (self.y <= 0 + self.half) {
 			self.y = 0 + self.half;
 			self.speedY *= -1 * self.wallBounceSpeedRatio;
-			LK.effects.flashScreen(0xffffff, 300); // Flash screen white for 300ms
 			bounceCounter = (bounceCounter || 1) * (bounceCounter + 1); // Increment bounce counter
+			// Flash the ball at bounce
+			LK.effects.flashObject(self, 0xffffff, 500);
 			// TODO : update bounce counter (x,y)
 		}
 		// Bottom boundary
 		if (ball.y > game.height - self.half) {
 			ball.y = game.height - self.half;
 			ball.speedY *= -1 * self.wallBounceSpeedRatio * self.floorBounceRatio;
-			LK.effects.flashScreen(0xffffff, 300); // Flash screen white for 300ms
 			bounceCounter = (bounceCounter || 1) * (bounceCounter + 1); // Increment bounce counter
+			// Flash the ball at bounce
+			LK.effects.flashObject(self, 0xffffff, 500);
 		}
 		// Left boundary
 		if (ball.x < 0 + self.half) {
 			ball.x = 0 + self.half;
 			ball.speedX *= -1 * self.wallBounceSpeedRatio;
-			LK.effects.flashScreen(0xffffff, 300); // Flash screen white for 300ms
 			bounceCounter = (bounceCounter || 1) * (bounceCounter + 1); // Increment bounce counter
+			// Flash the ball at bounce
+			LK.effects.flashObject(self, 0xffffff, 500);
 		}
 		// Right boundary
 		if (ball.x > game.width - self.half) {
 			ball.x = game.width - self.half;
 			ball.speedX *= -1 * self.wallBounceSpeedRatio;
-			LK.effects.flashScreen(0xffffff, 300); // Flash screen white for 300ms
 			bounceCounter = (bounceCounter || 1) * (bounceCounter + 1); // Increment bounce counter
+			// Flash the ball at bounce
+			LK.effects.flashObject(self, 0xffffff, 500);
 		}
 		// Reset ball when in bottom and its speed is very low
 		if (ball.y > game.height * 0.6 && Math.abs(self.speedX) < 5 && Math.abs(self.speedY) < 5) {
 			self.reset();