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 II RPG
Doom II RPG is a first-person shooter role-playing video game, the sequel to "Doom RPG". It was released for mobile phones on November 23, 2009 and for iPhones on February 8, 2010. It uses the "Wolfenstein RPG" engine and was developed by id partners Fountainhead Entertainment via the merger id Mobile.