While the basic gameplay of exploring levels, shooting enemies, collecting treasures, keys and power-ups remain the same, only half of the original game's 60 levels have been retained. Each of those 30 levels (grouped into six missions, with two levels being secret ones) is a simplified version of an original level. The end bosses for the missions are taken from both Wolfenstein 3D and its prequel, Spear of Destiny.
The original's weapons (knife, pistol, machine gun, chaingun) all return, but there are also two completely new tools of destruction: a flame thrower and a rocket launcher.