E4M2: Perfect Hatred is the second map of Thy Flesh Consumed of The Ultimate Doom. Designed by John Romero, and uses the music track "Donna to the Rescue".
On Ultra-Violence it is the hardest level not only of the episode but also in the entire Doom series, harder than the previous level. 12 Barons of Hell while you may lose health even after you have used ALL medikits, really? All enemies at the beginning are facing you, you cannot avoid them!
Fron the start point, run the left stairs up, turn right, and press the switch. (If you fell down into the lava, take the southeast lava stairs back up) Then fall down, kill the Imps you see, press the lion switch, and then run unto the ledge. (The switch can only be pressed once, so if you miss or fall off the ledge, you must take the stairs up, take the teleporter back, and go with the ledge raised) Then run to the room with the plasma rifle, kill the Baron of Hell, and there is the yellow key, along with an energy cell pack. Grab both, and go back to the beginning using that teleporter. Run the right stairs, turn left, and press the yellow switch. There will be a new opening which will summon a plenty of Lost Souls, then run there, and you will see a window. Get into there, and get to the southernmost area. Go up the stairs, kill the pack of Lost Souls, turn left, kill the Baron of Hell, grab the blue key, and head back using that teleporter. Run the left stairs again, press on the blue pillar to lower it, go up the stairs, and prepare to fight a Cyberdemon. After you kill the Cyberdemon, a door will open, with a couple of Cacodemons, continue forward, and press the exit switch.
I'm really sorry that I cannot be more specific, but unfortunately that's just how the designer of this map designed it to be played, @ a faster pace than normal. This level is harder than E4M1: Hell Beneath. In that level you only need to kill 8 shotgun guys at the beginning, while here at the beginning you must kill more powerfull monsters, including a lot of Cacodemons, Imps, and Demons. Also, there are 12 Barons of Hell, and if you don't know how to avoid projectiles, dodge shotgun blasts from shotgun guys, and/or dodge melee attacks, then you're going to die a plenty! There are medikits, but not a lot, and you must kill a lot of enemies before you can grab the health. You do get powerfull weapons, but the MAIN thing making this level harder than the last level is that you must kill a Cyberdemon without the BFG9000 (unless you could perform a telefrag on the Cyberdemon), while in the last level are only 63 enemies, and no Cyberdemon, only 5 barons of hell, and some more monsters that you can actually handle. Here, you must know how to cross the lava (I think this level should be renamed to Hell Beneath 2, because there is lava (hell) at the very bottom), by running, while there are enemies unavoidable. With a Pistol Start, this level is much more difficult, since you don't get any weapons (except for the shotgun) at the beginning. Therefore, this level was said as the hardest level of the episode. The last level would be the 2nd hardest level, due to no medikits. Here, if you get injured in the stone area, you don't get a lot of medicine, so try to do this map cautiosly, but do not take your time. You might get surrounded by enemies, or get fired upon from a lot of angles, since I don't think any monsters have the Deaf flag set, and therefore can detect you if you take this map slow. Still you must be very very very careful, otherwise you're going to die more than the last level, since this map does more trouble than the last one has. Nevertheless, in any way that you guess the normal exit, you will get hurt at least once unless you're as talented as my friend.
There is a walkthrough of the level on Ultra-Violence difficulty available in YouTube: http://www.youtube.com/watch?v=6jSklY9Mz9E . Note that this does show two of the three secrets in the level, but not show the exit to the secret level, detailed in #3 below.
- From the room with the Baron of Hell, there is a secret right to the left of the teleporter. You get a berserk and energy cell pack. Another to the right, if you take the teleporter from the north angle, you come to a room near the Cyberdemon where you get a megaarmor and a box of rockets. You can grab the BFG9000 by running into the wall, but it's not supported on the MS-DOS version...
- When the exit door is open, a teleporter near the soul sphere also opens. Take it to telefrag the Cyberdemon, saving you a lot of work. The wall is actually a lift.
- Secret exit: Lowering the wall will also lower another wall near the Baron's room. Quickly run into the opening, and you get your exit to E4M9: Fear.
So, after comparing the previous map and this map, I have to say E4M2 is harder, read above to see more.