MAP31: The Descent II (Hell Revealed II)

This map starts off with three rooms, Forward, left, and right. Left there is a Super shotgun followed by a trap where a bunch of Baron of Hell, will attack you. The right path, takes you down a life with two revenant guarding a plasma rifle and a rocket launcher. The path forward takes you to the main portion of the level. You grab the BFG9000 and behind the 4 sided switch pillars is a Cyberdemon kill it with the BFG and shoot the switches and the floor should start descending downward. Then you have ammo and health distributed around use it wisely as hordes of monsters teleport in... In including 10 archviles. The descent is roughly 5-10 minutes. Then you've finished 1/4'th of the map!