Wait until the letter "A" leaves the screen. Then, if you are Player One (the red circle), you will use the arrow keys to move yourself. If you are Player Two (the blue circle), you will use the WASD keys. The ball will move around. You want to keep the ball out of your goal by bumping into it. When you touch it, it will bounce off of you. Try and score as many goals as possible (the goals are the white rectangles).
This is actually TSouthard's game. He had me make it for him before he got his own profile. I'm holding a contest. You have probably noticed when the space bar or "z" is pressed, either Player One's or Player Two's score goes up by a point. Post in the comments how high you can get a score to go.