This is the first demo I found looong ago somebody playing the whole game in Nightmare skill. He didn't use any of the shortcuts discovered (not much) later.
00:05 Map01, Entryway
00:53 Map02, Underhalls
03:40 Map03, Gauntlet
05:05 Map04, The Focus
07:38 Map05, The Waste Tunnels
10:44 Map06, The Crusher
15:12 Map07, Dead Simple
17:03 Map08, Tricks And Traps
19:08 Map09, The Pit
21:45 Map10, Refueling Base
24:24 Map11, Circle Of Death
27:08 Map12, The Factory
29:33 Map13, Downtown
33:17 Map14, The Inmost Dens
36:20 Map15, Industrial Zone
37:54 Map31, Wolfenstein (Secret Level 1)
39:58 Map32, Grosse (Secret Level 2)
40:58 Map16, Subrubs
41:58 Map17, Tenements
45:59 Map18, The Coutyard
46:54 Map19, The Citadel
48:59 Map20, Gotcha!
51:36 Map21, Nirvana
53:36 Map22, The Catacombs
56:50 Map23, Barrels O' Fun
59:38 Map24, The Chasm
1:04:04 Map25, Bloodfalls
1:06:00 Map26, The Abandoned Mines
1:08:06 Map27, Monster Condo
1:10:15 Map28, The Spirit World
1:12:18 Map29, The Living End
1:16:20 Map30, The Icon Of Sin
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