You press the green flag. You control one of two paddles, left or right. You use the arrow keys to move the left paddle, and wasd to control the right paddle. you can only see your paddle if the glow of the light (ball) is touching the paddle. It is usually over quickly, because, well you can't see your paddle, so it is a difficult game.
HP726 and I came up with this idea, and so I made it. Enjoy!
