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.
Id Tech 4
id Tech 4, popularly known as the "Doom 3" engine, is a game engine developed by id Software and first used in the video game "Doom 3". The engine was designed by John Carmack. Carmack also created previous game engines, such as those for "Doom" and "Quake", which are widely recognized as significant advances in the field. This OpenGL-based game engine has also been used in "Quake 4", "Prey", "", "Wolfenstein", and "Brink".