The Campaign - Final Sin

Move forward and around the wall. Look right for a cracked wall and Melee it.

Head to the other side, climb the shelf, and jump into the vent. Follow it to the end, drop down, and grab the 1-Up.

From the exit, jump/dash to the wall and climb up. Defeat Revenants, Prowlers, Whiplash, Mancubus, Arachnotron, Cacodemon, Pain Elemental, Hell Baron, and Tyrant. A Doom Hunter will appear after they are all dead.

Keep moving, use Glory Kills and Chainsaw for ammo. Use Ice Bomb for space and Flame Belcher for damage/armor. Grab the Argent Ammo at the top of the area; it will one-hit the Tyrant. For the Doom Hunter: use Pulse Rifle to break shields, Blood Punch to destroy its sled, then Homing Rockets to stagger or kill it.

Once all enemies are dead, head to the top left section and grab the Auto Map-Station. Loot the area for health, ammo, and shields.

Climb the stairs by the Map-Station, circle the walkway, and snipe the Soldier and Revenant. Jump across and kill any remaining Revenant. Jump to the left ledge, Melee the wall, climb up, and enter the shaft for a 1-Up.

Melee the cracked pipes and kill the Soldiers. Jump to the right wall, then look left to see another. Jump/dash to reach it. Look left again and jump inside the building. Defeat the Mancubus, Prowler, and fodder. Drop an Ice Bomb, use Flame Belcher, and clear them out.

Move forward and circle the building. An Arachnotron and fodder are around the left corner. Snipe its cannon and use Blood Punch to defeat it. Move forward. Enter the building at the end and look at the left elevator shaft. Shoot the switch between the doors. Use the left shaft to climb up, turn around, and jump up the ledge. Grab the Codex entry to the right of the Hologram.

Turn around and enter the left elevator shaft. Climb into the vent and drop down to get a 1-Up.

Head back to where you dropped down, take a left up the ledges, smash the glass, and head right past the Hologram. In the hallway, a large enemy will break through the building. Head right, grab health and ammo, then head left. Defeat a Revenant, Carcass, and Hell Knight. Keep moving forward.

Jump across to the scaffolding at the bottom of the building. Jump across them and into the building. A Hell Knight, Carcass, Prowler, Whiplash, and fodder will appear while a Buff Totem is active. Use the left side of the area, circle around, and go through the hallway to find and Melee the Totem. Once destroyed, use Ice Bombs to immobilize and Homing Rockets to clear the larger enemies. Grab the BFG ammo before heading up the stairway.

At the top of the stairs, a Dread Knight and Mancubus will appear. Use Rockets on the Knight or Ballista on both. Glory Kill them and use the Chainsaw on the Zombie at the top. Cross the gap and kill the Soldier. Grab the ammo. Head left. More demons appear: an Arachnotron, a Carcass, and a Cyber Mancubus. Disarm the Arachnotron, then kill the Carcass. Freeze the Cyber Mancubus and Blood Punch it, or Glory Kill fodder if you can't. Defeat the Arachnotron last.

Head all the way forward, grab health on the left, and climb the wall. Jump onto the ledge at the top. Head left and follow it to the end. Enter the vent on the side of the rear wall.

Smash the grate inside, drop to the floor below for a Blue Face Power Up. Smash your way back out and head back up, taking the ramp on the right.

Kill the Revenant and grab the Argent Ammo. At the top, kill Prowlers, an Arachnotron, a Cacodemon, and a Marauder. (Note: Do not use the sword on the Marauder; its shield blocks it.)

Clear any remaining fodder. A blue column will appear. Take it. Turn right and look into the window with Soldiers fighting. Snipe them if desired and jump/dash in. Kill them and look out the other window to see the bar and wall – your way forward. Kill fodder at the top and grab Argent ammo. Drop to the scaffolding and walk right. At the end, look left to see a Tyrant, Revenant, Cyber-Mancubus, and fodder fighting.

The enemies won't kill each other. Equip the BFG 9000 if you have ammo. Jump/dash to the glowing green item (BFG ammo) to the left, get behind the Tyrant, and fire. Grab the other ammo and switch to Rockets to finish the Tyrant. A Hell Baron and Revenant with two more Tyrants appear. Line up the Tyrants and use the BFG again. Use Rockets or Pulse Rifle to take them down. Enemies will glow red; there is no Archvile. Run into the main area and use the blue column to the left of the stairs, or climb the stairs, to get to the upper floor. Head left and around to find and smash something. Get back to the fight. Clear the remaining Heavy Demons and loot the area. From the upper floor, face the lobby sign and jump/dash to the wall.

Kill the 2 Revenants and Hell Knight at the top, then head up the stairs and quickly disarm the Mancubus & Arachnotron while the Hell Baron approaches. Watch your ammo and take them out with Ice Bombs, Grenades, Rockets, or Super Shotgun.