The gameplay is relatively simple. Swarm after swarm of alien armies attack the player’s ship that moved left and right at the bottom of the wraparound screen. The ship can only have one shot on screen at a time. The player defeats one swarm, only to have it replaced by another more aggressive and challenging swarm in the next screen. A plain and repetitive starfield scrolls in the background.
Blue Galaxian : 30 points in formation, 60 points in flight
Purple Galaxian : 40 points in formation, 80 points in flight
Red Galaxian : 50 points in formation, 100 points in flight
Flagship : 60 points in formation, 150 points in flight
Flagship : 200 points in flight with one escort
Flagship : 300 points in flight with two escorts, Flagship killed before both escorts
Flagship : 800 points in flight with two escorts, Flagship killed after both escorts