Asternoid is an asteroids clone, with many advanced features, and great source code. The keys are listed below. The basic idea is to move your ship around, and destroy all the asteroids. They will break into smaller sections a few times, so the task can get a little exciting, sometimes. The
mouse pauses and unpauses the game.

ACTION	KEY
Left	J
Right	L
Thrust	K
Shoot	Space bar
Shield	Z