The object of the game is to destroy the Galaxian fleet before they blast your laser base to stardust. The fleet lines up in ranking order before plunging down to bombard your laser base. If a Galaxian survives a bombing run, he returns to his original position.

You begin the game with three laser bases, and score points for each Galaxian destroyed with your laser missiles. You earn extra points for destroying a Galaxian in flight, and at 7000 points, you receive a bonus laser base.

The Galaxian fleet attacks in waves. Each time you manage to destroy an entire wave, another fiercer wave is launched.