ep2-0615.zip (09/09/1995)
Skills needed: tapping your use button till you find the switch

Difficulty: easy, just watch your health as it goes down...
Description:
This is really an ancient trick... and a really cool one, although nowadays everybody got so much used to it that we don't even notice it. It's based on the DOOM engine's inability to give switches a z-coordinate. When this bug/feature of the engine was discovered, a lot of tricks like this were discovered. It seems like the designers didn't know about it...
This trick really helped E2M2 be the easiest level in Episode 2 speedruns.