My app is very simple to use. When you open the app, the ball will start moving. The top paddle is the computer paddle. It moves automatically and gets to the ball every time. The bottom paddle is where you come into play. You move it with your finger and try to get to the ball. If the ball gets past your paddle, you lose. The stopwatch in the middle of the screen is the seconds you have lasted. The higher the number, the better. Also, if you want more of a challenge, flip the device horizontal. Now you cannot see the paddles, and it is harder to hit them. Good luck!