bouncing ball, but with a twist! don't click the ball or you'll find out! try not to scare the ball!
I got the idea from a tutorial. I didn't copy, just used the idea of a bouncing ball. I added the sound on my own If you are having trouble with it not making the sound when it hits the wall, or not changing color, don't worry, I had that problem too, if you don't like it try turbo mode, but I don't know if that will help or not.