MAP13: Dark Citadel is the thirteenth level of Doom 64. It is easily one of the most eerie levels in the game in regard to the demonic architecture and creepy ambience by way of much of the stage being very dark and containing creepy and sad BGM. Not the toughest level, but one that can surprise the player moreso than others. You will find yourself getting randomly ambushed by demons, hell knights, and barons throughout the level. This stage uses the starry skyline from the earlier 8 stages.