Can someone help me program my TI-84 Plus Calculator?

Can someone help me program on my TI-84 Plus? I want to program the game asteroids, where you control a ship flying through an asteroid field. You have to avoid the asteroids, and shot to destroy them. Or something along those lines. Or if you know how to program a snake game where you eat dots and each dot gives you a bigger tail. Descriptions on either of these games will be greatly appreciated and will result in an additional 10 points. Thank You