Destroy waves of attacking Galaxians by moving left and right and firing. The Galaxians will sit in formation above you, and you can pick them off with your Cannon. Beware - You can only fire one shot at a time. Your next bullet will not reappear until your last one has disappeared. Also, the Galaxians become more and more aggressive as the waves proceed. They will break formation and swoop down on you as they attack.
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