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In this game you control a small spaceship, with the mission of destroying the endless supply of giant crabs blocking your passage through the Crab Nebula. To destroy a crab you must first clear a path through the four layers of moving walls, some portions of which are indestructible. The crabs are not about to stand still during this barrage, and will randomly scamper back and forth. Also not content with merely dodging your shots, the crabs will occasionally fire missiles aimed downward at you. You can score points by taking out wall sections, eliminating the missiles fired at you, or destroying the crabs themselves.