Doom Zero (Ultra-Violence Plus 100%) - Map 12: Underland

Map 12 revolves around an ever-rising central cross-shaped bridge and a few nasty ambushes in the first half, and the ending room with all of the Barons of Hell will butcher you if you don't know about the secret areas to hide in.
Secrets: 2:19, 3:52, 7:01, 10:05, 12:48 (2 secrets in one)
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