Use your mouse to move the red rectangle up and down the screen. Get it past the CPU to score a point. First to nine wins. Every time the ball touches one of the rectangles it gets a little bit faster up to a maximum speed. Right now I have the CPU set to medium difficulty, so it may take a little while for the ball to get enough speed to the point where you can score. Additionally, hitting the green flag will reset that scores and also change the starting direction of the ball, so if it starts off in a direction that will take forever to get to you, just reset.