It is a two person game. You are the blue or red tennis racket. You try to hit the ball each time it comes towards you. If it goes behind you, your opponent gets a point. If you're blue, you move up by pressing the "k" key and down by pressing the "m" key. If you're red, you move up by pressing the "a" key and down by pressing the "z" key. When one person gets 10 points, the game is over.
