As a spaceship moving left to right at the bottom of the screen, shoot up at enemies as they enter, assemble in formation and fly down at you. If you allowed an alien to capture one of your ships in its tractor beam, you could shoot the foe later and double your fire power!
It was one of the first games with a bonus stage. Along with Pac-Man and Pong, this game shares the curse of being one of the most bootlegged games of all time.
Ctrl, Spacebar and arrow keys to control
5 - Credit
1 - Player 1
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