The shareware release contains one episode, consisting of ten missions (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 subsequent FPS games.
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