DOOM II: No Rest For The Living - Ultra Violence - Map 04: Hell Mountain
Looking at the start of this level, there does seem to be some link between the levels. It looks like the keep that you end up in from the previous level and then expands into rugged terrain as well.
This level starts a bit harder because you have Arachnotrons sniping you from another keep type area as well as Commandos.
It's probably a good idea to take out the Commandos and rush the Arachnotrons to avoid you getting sniped too much.
The keep isn't that large, but as you can see by the coloured doors, you'll be coming through it a lot. I like the fact that it's embedded into the mountains.
That switch did annoy me, and I didn't work out what it did. But it had nothing to do with the secret exit.
That Pain Elemental behind the bloodfall was something I did remember, and I remembered it being a handy secret there too, you need the Red Key to access the secret level, as one of the switches involved in accessing it needs the Red Key (the one on the hill).
The Plasma Rifle secret is something worth killing the Hell Knights and Barons for too.
The normal exit leads you to map 05, and as you'll guess by the exit area, it's hell themed.
But... Press all the switches near the end of the keep area and run from the lift and you'll find a secret exit in the Mountain's wall.
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