Brian made the 10 new levels, which appear in Episode 1. The remaining maps all come from Wolfbel 1.
Zeitz was responsible for culling the graphics, all of which were borrowed from other mods. The SS guard from the Spear Mission Packs (Lost Episodes) replaces the mutant, and the officer has been replaced by the chain gun-wielding blue guard from Ultimate Wolfenstein. Some sounds were also replaced.
These were all included in the PC version, but not in the Acorn/Archimedes version which was released on its own right as a map set. This map set was available for PC users as well.
On November 2, 2005 an updated PC version was released with a different EXE in which Brian had made rudimentary coding changes for the mod, including ceiling colors and increased health and ammo. Some levels were slightly updated as well. This new version overwrote the original July 2000 version.