1 - dungeon level
2 - arcane chambers
3 - sargauth level
3b - Skullport
4 - twisted caverns
5 - wyllowood
6 - lost level
7 - maddgoth's castle
8 - slitherswamp
9 - dweomercore <-- edited
10 - mulral's gauntlet <-- clarified
11 - troglodyte warrens
12 - maze level
13 - trobriand's graveyards <-- checked FR Wiki for spelling
14 - (unsure, might be arcanadoom?)
15 - obstacle course
16 - Crystal labyrinth
17 - seadeeps
18 - (unsure, might be vaprakdoom?)
19 - caverns of ooze
20 - runestone caverns (near as I can make out anyway . . .)
21 - terminus level
22 - shadowdusk
23 - mad wizard's lair
2 - arcane chambers
3 - sargauth level
3b - Skullport
4 - twisted caverns
5 - wyllowood
6 - lost level
7 - maddgoth's castle
8 - slitherswamp
9 - dweomercore <-- edited
10 - mulral's gauntlet <-- clarified
11 - troglodyte warrens
12 - maze level
13 - trobriand's graveyards <-- checked FR Wiki for spelling
14 - (unsure, might be arcanadoom?)
15 - obstacle course
16 - Crystal labyrinth
17 - seadeeps
18 - (unsure, might be vaprakdoom?)
19 - caverns of ooze
20 - runestone caverns (near as I can make out anyway . . .)
21 - terminus level
22 - shadowdusk
23 - mad wizard's lair