Qix (1981), arcade. Later re-released for Atari 5200, Atari 400/800, Apple II, Commodore 64, DOS, Amiga, Apple IIGS, Game Boy, NES, and Atari Lynx, with each version featuring graphic enhancements depending on the console's capabilities. The Game Boy version was also re-released in 2011 for 3DS Virtual Console.
Qix II-Tournament (1982), Arcade.
Super Qix (1987), Arcade.
Volfied (1989), Arcade. Also released for DOS, and later released for Sega Mega Drive/Genesis as Ultimate Qix and for PlayStation as Qix Neo. Later also released for mobile phone as Volfied.
Twin Qix (1995), Arcade. Never released to the public, only prototype versions were created and distributed in limited quantity.
Qix Adventure (November 16, 2000), Game Boy Color.