PSX DOOM - Level 17: Hell Keep (Nightmare!)
This one is a fair bit trickier than it looks.
If you don't shoot those barrels before going through the teleport, you're going to be shot. Or possibly blown up.
Speed is also important; idle around killing everything and you'll just get swamped. Demons in particular can be a real headache; if not by directly attacking, then by simply being obstructive.
And even the last few moments can cause problems - everyting by that point has respawned, and is potentially blocking your way to the exit door; if you've missed the Plasma Rifle, things will get very, very messy.
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