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The Gravis PC GamePad is a game port game controller produced by Advanced Gravis Computer Technology first released in 1991. It was the first gamepad for the IBM PC compatible in a market then dominated by joysticks.[citation needed] Included with the gamepad was a shareware Commander Keen game, episode 1, Marooned on Mars, which was later replaced with the shareware episode 4, Secret of the Oracle which supported all 4 buttons. The gamepad is no longer manufactured, as Gravis was acquired in 1997 by Kensington Computer Products Group.