MAP32: Mostly Harmful (Hell Revealed)

MAP32: Mostly Harmful, designed by Yonatan Donner, is the second secret level of Hell Revealed.

Description
According to the Hell Revealed info pack:


 * You have gone through a lot to get here - found many secrets and shown you deserve to get to the super-secret level. And this level is the deadliest of them all - not to mention it's extremely difficult to get rid of all the monsters here, new ones are created all the time! So you are racing against time. You will need all 3 keys to enter the exit - and only the dead are allowed to leave! The level also has some nice effects, like bridges you can go both above and under, arches that curve both below and above, and anti-coward tricks. See how fast you can finish this one on Ultra-Violence, if you can!


 * Size: small
 * Difficulty: you're dead

Speedrunning
See:
 * Hell Revealed at Compet-N
 * Hell Revealed at the Doom Speed Demos Archive