One of the most addictive of the classic games for the Atari is Breakout where you have to demolish bricks from the wall with your bouncing ball. Here is another version of the game written in BASIC to let you see how this kind of game can be programmed. You could probably even add a few things of your own to make a customised version.
The object of the game is simple and instructions are given in the listing. Go to it and see how many walls you can knock down.