Level 25: Perfect Hatred

Kill the two Shotgun Guys near the start.

Defeat the Demon and then eliminate all Imps, Demons, and Cacodemons across the gap.

Position yourself in front of the left staircase, back up, and run across the gap to the platform.

Hit the switch on the platform, turn around, and jump through the opened wall.

In the new area, kill the Shotgun Guys and Imps, then drop into the lava pit.

Kill the Imp, grab the Stimpacks, and position yourself in front of the switch.

Turn right, hit the switch, and immediately run to the rising platform before it ascends too high.

Turn right on the platform and follow the bridge to a small gap, run across it.

Pick up the Plasma Gun; a wall will open, revealing a Hell Knight.

Kill the Hell Knight, grab the Energy Cell Pack and Yellow Key.

Turn around and drop back into the pit.

Go through the new opening and head up the stairs.

At the top, kill the Imps, Hell Knights, and Shotgun Guys, then proceed through the opening.

Enter the teleporter.

Press Circle on the walls to the left until a hidden door opens.

Grab the Berserk and Energy Cell Pack from the secret room, then exit.

Re-enter the teleporter to return to the level's starting point.

Go to the right staircase, run across it over the gap.

Equip your BFG, hit the Yellow Key-requiring switch to your left, and turn right.

Kill the revealed Lost Souls and Hell Knights with two BFG shots.

Run across the gap to the platform where the enemies were.

Turn right and run across the gap into the opening in the gray wall.

Head right and drop to the floor below.

Go to the other end of the room, killing Spectres, Cacodemons, and Hell Knights, picking up Energy Cell Packs.

Head up the stairs at the end of the room.

Kill the Lost Souls at the top and go through the opening to the left.

Kill the Hell Knight and grab the Blue Key.

Return and enter the teleporter to the left to go back to the level's starting point.

Go to the left staircase, back up, and run across it.

Head straight and run across the gap to the next platform.

Destroy the barrel and open the Blue Door it was blocking.

Head up the stairs.

Kill the Hell Knight to your left at the top and approach the door.

Kill all the Cacodemons that appear when the door opens.

Turn around, head back down the stairs, and enter the new teleporter to your left.

You will be teleported to where the Hell Knight was; pick up the BFG and hit the switch to lower the lift.

Exit the area, fall into the gap to your right, and run, following the right-hand wall to a new opening.

Grab the Soulsphere and MegaArmor from the secret room. If you can't reach them, go to the other end of the room, through the opening, and try again.

Leave the secret room and head right to the level's starting point.

Go through the opening to your left and head up the stairs.

Kill the Imps at the top and turn right.

Go to the other end of the room past the Blue Door again.

Go through the now-opened door.

Grab the Energy Cell Packs and hit the exit switch.