The file names are hardcoded, but the extension varies depending on the game - WL1 for the shareware, W元 for the registered game, WL6 for the full game with the added 'nocturnal missions', SDM for the Spear of Destiny demo, and SOD for the full Spear of Destiny game. The game data is spread across four files ( AUDIOT, GAMEMAPS, VGAGRAPH, and VSWAP) with four additional files ( AUDIOHED, VGADICT, VGAHEAD, and MAPHEAD) containing metadata such as offset positions, size, and compression dictionary allowing to actually retrieve the game data. Like the Doom engine, the Wolfenstein 3D engine was also used for several other games Blake Stone: Aliens of Gold, Blake Stone: Planet Strike, Corridor 7: Alien Invasion, Operation Bodycount, and Super 3D Noah's Ark, which enhance the engine with numerous features, some similar to those id Software added to Doom such as textured planes, distance shading, teleporters and switches. Much of the source code for Wolfenstein 3D was later reused in Apogee's Rise of the Triad, released in 1995.
While walls are textured, horizontal planes forming the floor and ceiling are shaded with flat colors.
The engine is a fairly simple textbook raycaster, using maps composed of tiles, which only allow 90-degree angles between walls.
