Press the green flag to play. You are the player on the right. When you catch the ball, press space to throw it back at your friend do this as many times as you can. But if you press space at the wrong time, you lose and you have to start over. Beware, because your friend is a very fast thrower. This took a lot of time (2 days I think ) so please star it. I'd also like to see your feedback in the comments so I can improve it.