The inhabitants of a world, far away, are been hit by dark ray and have been
transformed into rampaging mutants. Your job is to kill those mutants.

You are controlling a tiny space craft, which is centered on the screen when
you start a level. However, you can move your craft with your keyboard to any
point on the screen. You are aiming your weapon with your mouse.

Your job is now to kill anything on the screen, while avoiding all enemies. If
they touch you, your ship explodes and you have lost a life. Once the last
enemy is gone, you proceed with the next level. There are 89 different levels
to play.