The level's jagged rock walls, ceiling color, and irregular shape suggest that it is carved from solid rock, or that it takes place in a natural cave.
|Part of||Episode 5|
The level appears either to be carved out of solid rock or to take place in a natural cave, as the outer walls form a very irregular shape and seem to be composed of jagged rock, the color of which matches that of the ceiling. A cluster of rooms built of stone exists in the center of this natural or artificial cavity.
To exit the level, one must find both silver and gold keys. These can both be found in the inner group of rooms, the gold key through a convoluted hallway, the silver through a door locked by the gold key. In the east, the elevator room itself is composed of red brick, and is heavily guarded by SS and Officers, including one Officer in the elevator (beginning at "Bring 'em on!" difficulty).
- Many of the enemies in the level are Patrolling when BJ enters the level, but their routes appear to be very poorly designed: enemies placed too close together collide and glitch, and in two instances a blocking column stands directly in the way of the Patrol route, causing the same effect.
- "John" (presumably John Romero) is quoted as saying "I wanted this level to feel like you were in an underground cavern, about half-way up in the mountain that the castle is built upon. That's all I wanted to say."
|Episode One||Floor 1 · Floor 2 · Floor 3 · Floor 4 · Floor 5 · Floor 6 · Floor 7 · Floor 8 · Floor 9 (Boss) · Floor 10 (Secret)|
|Episode Two||Floor 1 · Floor 2 · Floor 3 · Floor 4 · Floor 5 · Floor 6 · Floor 7 · Floor 8 · Floor 9 (Boss) · Floor 10 (Secret)|
|Episode Three||Floor 1 · Floor 2 · Floor 3 · Floor 4 · Floor 5 · Floor 6 · Floor 7 · Floor 8 · Floor 9 (Boss) · Floor 10 (Secret)|