Doom (1993 video game)
The ability for others to create custom levels and otherwise modify the game using WAD files turned out to be a popular aspect of "Doom". Gaining the first large mod-making community, "Doom" affected the culture surrounding first-person shooters, and also the industry. Several future professional game designers started their careers making "Doom" WADs as a hobby, among them Tim Willits, who later became the lead designer at id Software.
Doom (1993 video game)
The popularity of "Doom" led to the development of an expanded version, "The Ultimate Doom" (1995), which includes a fourth episode. Additionally, numerous ports of the game have been released by other companies. An unofficial port of "Doom" to Linux was released by id programmer Dave Taylor in 1994; it was hosted by id but not supported or made official. Official ports of "Doom" were released for AmigaOS in 1993, 32X, Atari Jaguar, and Mac OS in 1994, Super Nintendo Entertainment System, PlayStation, and Windows in 1995, 3DO in 1996, Sega Saturn in 1997, Game Boy Advance in 2001, Xbox 360 in 2006, iOS in 2009, and PlayStation 3 in 2012. Some of these were bestsellers even many years after the initial release. "Doom" has additionally been ported unofficially to numerous platforms; so many ports exist, including esotera such as smart thermostats and oscilloscopes, that variations on "It runs "Doom"" or "Can it run "Doom"?" are long-running phrases.