As pilot of the Millenium Orb, you must stop the evil Krohn from destroying the galaxy by traveling into a black hole comprising 30 Enigma Chambers (levels). Each is a puzzle on a dotted grid, with your score at the top and your fuel gauge at the right. You command two paddle-like "force shields" on the left and right edges of the screen, moving them up and down in parallel to bat your Orb between them.