South Park is a mod for shareware Wolfenstein. It dates to May 1998. Authorship is unknown.
Weapons have been edited, but not replaced as such; most Wolfenstein 3D sprites and walls have been retained, if not all. Sounds have been replaced for the guards, however.
The mod was an early set based on the series, which were less than one year old at the time of the mod's making. A mod that was more thorough in its integration of the South Park environment was 2003's Southern Hell.