A user called Step9 has released an unusual mod on ModDB, titled “Hitler’s Secret Department”.
The Russian Wolfenstein mod features 60 levels, and features some uniquely styled and simplistic maps. The level design makes for a quick and straightforward playthrough, especially on some maps (An example of an unplayable secret level…).
Note: There is a bug where your weapon may switch at random and become locked. Pressing either 1 or 2 on your keyboard should fix this and allow you to switch again.
Note: There is a bug where you may take random damage when entering doorways.