Wolfenstein 3D is a first-person shooter video game developed by id Software and published by Apogee Software. Originally released on May 5, 1992, for DOS, the game was inspired by the 1980s Muse Software video games Castle Wolfenstein and Beyond Castle Wolfenstein. A promotional version of Wolfenstein 3D was released as shareware, which allowed it to be copied widely. The game was originally released on the PC and later ported to a wide range of computer systems and video game consoles.

The shareware release contains one episode, consisting of ten levels. The commercial release consists of three episodes, which includes the shareware episode and its two subsequent episodes. Later releases also included a three-episode mission pack titled The Nocturnal Missions. The player assumes the role of a World War II Allied spy, William "B.J." Blazkowicz, attempting to escape from the Nazi German prison of Castle Wolfenstein. After the initial escape episode, Blazkowicz carries on a series of missions against the Nazis.

Wolfenstein 3D was a critical and commercial success. It is widely regarded as having helped popularize the genre on the PC, and having established the basic run-and-gun archetype for many subsequent first-person shooter games.

Spear of Destiny, often also called Spear, Wolfenstein 3D: Spear of Destiny or just SoD, is a 1992 first-person shooter computer game developed by id Software and published by FormGen Corporation, and is the prequel to id Software's Wolfenstein 3D. As in Wolfenstein 3D, the player assumes the role of allied spy William "B.J." Blazkowicz, on a mission trying to recapture the Spear of Destiny from the Nazis after it was stolen from Versailles.