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.