Eight regular levels, a boss level, and a secret level. The game is broken down into six episodes which further break down into ten levels each. Playing as a captured allied spy, you must escape your Nazi captors and foil their plans for world domination. It was pre-Doom, but you can see that many of the gameplay elements made their way into this future release. Wolfenstein 3D came out hot on the heels of the Commander Keen series and utilized the game engine created by John Cormack. The game was inspired by the 1980s Muse Software video game Castle Wolfenstein, a top-down infiltration game. It has since been ported for several systems including PC-98, Mac, Windows, PlayStation 3, and Xbox 360. Wolfenstein 3D is a first-person shooter developed by Id Software and published by Apogee Software in 1992 for DOS.