Part 25

In the area with 4 big pillars, use the barrels and Unwilling enemies to work on the Wait for It Challenge.

After pressing the switch, a fight begins with 3 Cacodaemons, 2 Hell Razers, Imps, 2 Spectres, 2 Hell Knights, and a Summoner.

Grab the Auto-Map, pull the Classic Map Doom Lever, and grab the Yellow Skull.

CLASSIC MAP 11.1 "Doom - House of Pain" is SECRET 11.3. Go back outside this room and down a hall to an area that looks funky on the map.

This will trigger the teleporter to open, and you can take it to return to the central room you started in.

On the opposite side, a new Teleporter has opened. This one will get you the Blue Skull.

Go through the teleport for the next fight in the Four Platform Arena.

Upon entering, 2 Mancubi spawn on 2 platforms (two Gauss Cannon Siege Mode blasts will take both of them). Then 3 Cacodaemons and Imps. Then some Revenants and a Hell Knight end this wave.

The gates surrounding the Quad Powerup lift and 4 Revenants spawn, one on each side of the square. Then 2 Cyber-Mancubi and 2 Mancubi spawn, ending the fight.

Take the Blue Skull. Teleport back to the Central Room.

Use both Skulls and interact with the knobs behind each door to trigger the next battle.

3 Imps spawn in a reliable location.

2 Pinkies are next.

2 Revenants, a Hell Knight, and a Spectre make up the next wave.

The final wave is 2 Hell Barons.

After the fight, two staircases open up below the main area. Go there and drop into a small hallway with some health and another drop.

When you stand up from the jump, there will be 3 Cacodaemons lurking around.

Use BFG or (better) Gauss Cannon Siege Mode to get the "Two Mouths to Feed" Challenge.

Jump onto the next platform, which has two large unlit torch/pillars on it.

The next platform has just one torch/pillar. Peer carefully down from the edge to see a small island. There is a doll on it. This is SECRET 11.2, COLLECTIBLE 11.1 "Chainsaw Model, Tealguy".

Continue hopping to the cave, where you will be greeted by a Mancubus.

Don't forget to get ELITE GUARD 11.1, and there's some armor too.

Continue along to some shotgun ammo and the last FIELD DRONE 11.1.

Go up the stairs to where some big demons are duking it out: 2 Mancubi, some Revenants, Imps, and a Cacodaemon. Help them kill each other and kill the Hell Razers, 2 Cyber-Mancubi, and whatever else spawns. There's a BFG and a Haste Powerup.

Get in good shape for the next fight.

The same demons will spawn on each end of the Paired Hallway: 2 Hell Barons, 2 Mancubi, and 4 Spectres. There's quite a bit of ammo around, and ELITE GUARD 11.2.

Exiting, 2 Cacodaemons will immediately stalk you; kill them with the rocket launcher.

Walk down to the treasure trove with a big armor. This will trigger 2 Mancubi to spawn. Retreat back to the original area and use Rockets or Gauss Cannon. Once you kill a Mancubus, 2 Hell Barons will spawn. Gauss Cannon or BFG is recommended.

Now, get SECRET 11.1. Look at the large statue/structure shaped like the head of a horned screaming demon. In its forehead, is a glowing pink rune symbol. Shoot it, and a weird cubic capsule will spit out of it and land next to you. This is COLLECTIBLE 11.2 "Gauss Cannon Model, Hazmatguy".

Stock up for the two Boss Fights.

This fellow has a force field that protects him from everything, so you must time your shots for when the field is down. Most of his attacks give you an opening.

His moves include: Club Attack (field is down as he attacks and right afterward), Charged Club Attack (similar, but damages everything in a radius), and Tri-Sphere Attack (can be attacked after blinking but before shooting, stunning him for a secondary attack).

Midway through the fight, he gains new tricks: Spinning Flaming Spiral (avoid flames, then attackable for a long window) and Three Drum Waves (slow-moving wave that does a lot of damage).

Toward the end, equip Dazed and Confused, as you have to Glory Kill him.

These guys act in concert. They lack the force-field.

Their moves include: Bed of Fire (jump over long fireballs), Fire Tornado (avoid), and Sphere Attack (shoot it right after it finishes inflating to stun him).

When one is stunned, you can often line them up to get double damage out.