DOOM II: The Master Levels (UV Playthrough) [PC] - MAP03: Canyon
If you're just aiming for getting from A - B, then this one's not a problem. If however, you want to make sure everything's dead before you leave... there's a bit of backtracking to be done.
The main path is very easy to deal with once you know which order to go through the rooms in; it's pretty much just a case of pointing your guns at whatever looks offensive and mowing it down with extreme prejudice. Although the hunting for secrets consists of re-visitng old areas, it's worth every moment, especially once you've already cleared the map (which is more than likely), although one secret is literally home to nothing but a Chaingunner.
That's a bit shit.
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