Doom (1993 video game)
Doom (typeset as DOOM in official documents and stylized as DooM in other media) is a 1993 first-person shooter (FPS) video game by id Software. It is considered one of the most significant and influential titles in video game history, for having helped to pioneer the now-ubiquitous first-person shooter. The original game was divided into three nine-level episodes and was distributed via shareware and mail order. The Ultimate Doom, an updated release of the original game featuring a fourth episode, was released in 1995 and sold at retail.
Doom engine
id Tech 1, also known as "Doom" engine, is the game engine that powers the id Software games "Doom" and "". It is also used in "Heretic", "", "Strife: Quest for the Sigil", "Hacx: Twitch 'n Kill", "Freedoom", and other games produced by licensees. It was created by John Carmack, with auxiliary functions written by Mike Abrash, John Romero, Dave Taylor, and Paul Radek. Originally developed on NeXT computers, it was ported to DOS for "Doom"'s initial release and was later ported to several game consoles and operating systems.