Apple II
Developed by Alien Technology Group, and published by Taito in 1989. Optimized for better visual appearance on the Apple IIgs.
Atari 400/800/XL/XE
Developed by Atari and published in 1982. In a rare move for Atari, they released a different version for computers than they did for the Atari 5200. This version utilizes more of the available screen resolution.
Atari 5200
Developed by Atari and published in 1982. This version is not identical to the Atari home computer version, and retains a more faithful look to the arcade version.
Atari Lynx
Developed by Knight Technologies and published under license from Telegames Inc. in 1991.
Commodore 64
Developed by Alien Technology Group, and published by Taito in 1989.
Commodore Amiga
Developed by Alien Technology Group, and published by Taito in 1989. Possibly the best looking of the four Alien Tech conversions.
Game Boy
Developed by Nintendo and published in 1990. Contains cut scenes between stages that feature Mario in a different location around the world, dressed in native fashions, but otherwise has no connection to Mario.
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Screen
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American box
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Japanese box
NES
Published by Taito in 1991, and only in the United States. Qix was never released for play on the Famicom in Japan.
PC
Developed by Alien Technology Group, and published by Taito in 1989. Programmed to work with CGA, MCGA, and EGA/VGA graphics cards.