The Final Fight is a mod for registered Wolfenstein, made by James Shain. It was originally released on July 28, 2003. Four years later it was redone, but in an entirely different version.
It features 10 levels, and is an obvious first time effort with the mapping consisting of large rooms, many guards and a random smattering of sprites and pickups.
No source code changes were featured, and it is thus playable in SDL.