level 1: entryway
level 2: underhalls
level 3: the gantlet
level 4: the focus
level 5: the waste tunnels
level 6: the crusher
level 7: dead simple
level 8: tricks and traps
level 9: the pit
level 10: refueling base
level 11: 'o' of destruction!
level 12: the factory
level 13: downtown
level 14: the inmost dens
level 15: industrial zone
level 16: suburbs
level 17: tenements
level 18: the courtyard
level 19: the citadel
level 20: gotcha!
level 21: nirvana
level 22: the catacombs
level 23: barrels o' fun
level 24: the chasm
level 25: bloodfalls
level 26: the abandoned mines
level 27: monster condo
level 28: the spirit world
level 29: the living end
level 30: icon of sin
level 31: wolfenstein
level 32: grosse