DOOM

Development and history Classic series (1992–1997) The game launched in an episodic format in 1993, with the first episode available as shareware and two more episodes available by mail order. The first episode was largely designed by John Romero . The title proved extremely popular, with the full version of the game selling one million copies. The term " Doom clone " became the name for the new genre now known as first-person shooters for several years.

Doom II: Hell on Earth was released in 1994 in a commercial format. Only minor changes were made at a technical level; the game featured new enemies, a new "Super Shotgun" weapon, and more complex levels. The game was followed by an expansion in 1995, titled Master Levels for Doom II , which added 20 additional levels. A fourth episode was added to the original game by the 1995 re-release.

From 1995 id Software were focused on the development of the new Quake series , which would be developed by the company throughout the late 1990s. Two additional games would be released over the following years, largely created by third-party developers under id's supervision. The first of these was Final Doom , which featured 64 levels based on the Doom II engine, organised into two episodes. TNT: Evilution was developed by the modding group TeamTNT and completed in November 1995, while the second episode The Plutonia Experiment was developed by TNT's Dario and Milo Casali and completed in January 1996.

Midway Games developed Doom 64 under id supervision for release in 1997. The title featured a new engine, with larger sprites and higher quality textures. The technical changes allowed for greater flexibility with the level design, such as the ability to adjust the geometry of the map during play. The classic metal soundtrack was replaced for a more ambient and eerie soundtrack, creating a unique atmosphere that would inspire future entries.

Id did not allow the title to be called Doom 3 , as the name was being reserved for a potential return to the franchise after the development of Quake .