MAP10: The Bleeding (Doom 64)
From DoomWiki.org
MAP10: The Bleeding is the tenth level it has an ambient horror music track the level is set in a hellish volcanic outpost the level is like a keep and the level is infested with imps, spectres and lots of mancubi the level itself consisits of lots of swith flipping in order to open doors and reveal new areas to eventually find the exit.