Part 13

Proceed down the corridor from the starting cutscene (a non-interactive cinematic the game plays automatically) and enter the door at the end.

Engage the three cleaners; one in front, one on the stairs above, and one on the stairs leading down. Watch out for grenades. Use the Kalashnikov to eliminate them and proceed to the top floors.

At the top, check the assorted boxes for Kalashnikov ammo and other items.

Return to the original floor and descend the stairs until you find a door jammed by a stick (this is the 3rd floor).

Open the door to find a bum. You can listen to his story or continue down the corridor to a room on the left blocked by fire.

Go back to the staircase and descend to the bottom-most floor.

Enter the double-door to find Violet. You will now have two allies to help fight the cleaners.

Go back through the double-door and proceed to the end of the corridor.

Halfway down, three cleaners will emerge from a room at the far end. Eliminate them and enter the room they came from on the left.

Go down the stairs, turn right, then right again, enter the utility room, and turn off the valve to stop the fire.

Check the lockers in the utility room for painkillers and exit. Check another locker on the right.

Go up the stairs and into the corridor to face three more cleaners. Use Bullet Time (a mechanic that slows down time) and the Kalashnikov.

Return to the 3rd floor and enter the room that was previously blocked by fire.

Check the bathroom on the right for painkillers. Enter the main room and approach the window.

Climb out the window onto the ledge. Walk left along the ledge. Three cleaners will attack from the floor below. Snipe them one by one.

Continue along the ledge until you reach scaffolding. Quickly jump onto it as three more cleaners arrive on the floor below. Snipe them from the scaffolding.

Go to the top of the scaffolding and jump diagonally to the ledge on your left. Snipe any remaining cleaners from this position.

Go to the edge of this ledge and save your progress at a checkpoint (a point where the game saves automatically or can be manually saved).

Jump onto the next scaffolding. Be careful, as it will fall. Do not move and let it descend.

You will be safely deposited to the ground. A van with five cleaners will arrive to your right. Throw a timed grenade (an explosive that detonates after a set time) near the opening back door of the van.

Eliminate any remaining cleaners with the Kalashnikov or Sniper Rifle, utilizing Bullet Time.