Castle Heidenheim is a location in the Episode 5 of Original Encounter and Episode 6 of Wolfenstein 3D. It is one of two conflicting settings given for Episode 6 of Wolfenstein 3D. The castle is described as being "perched atop a small rise between two massive mountains". Inside the castle can be found General Fettgesicht, the general behind the German chemical weapons plan. BJ Blazkowicz must enter the castle and kill the General to complete the final Episode of Wolfenstein 3D. Offenbach is separately described as the setting of the Episode, creating a contradiction.