Dungeon	Levels 1-4	Gray Stone walls Easy to see everything Lots of Scrolls, and Books Lots of Shrines
Catacombs	Levels 5-8	Dark Gray stone walls Very hard to see Books, Scrolls, and better armor Some Shrines here
Caves	Levels 9-12	Lava flows everywhere Very easy to see everything Much better armor, Swarms of bad guys
Hell	Levels 13-16	Walls made of Bone & Blood Hard to see Excellent magic items here Cauldrons here