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 (1993 video game)
The "Doom" game engine was licensed by id Software to several other companies, who released their own games using the technology, including "Heretic", "", "Strife: Quest for the Sigil", and "Hacx: Twitch 'n Kill". A "Doom"-based game called "Chex Quest" was released in 1996 by Ralston Foods as a promotion to increase cereal sales, and the United States Marine Corps released "Marine Doom".