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This 1981 vector graphics arcade game is available in both two- and four-player configurations. A top-down space shooter set within a bounded playfield, where the player maneuvers a ship using rotation, thrust and forward-firing controls (much like Asteroids or Space War). Each stage is populated by autmated drone ships (or by competing players), and dominated by the titular enemy: a moving, rotating space fortress surrounded by a lethal force field.