Part 11

From the middle of the room, follow the wallwalk (a moving platform) straight up onto the higher level.

Eliminate the mounted security turret and the hunter present.

Use the touch screen to activate the moving wallwalk panels.

From your current position, follow the wallwalk down and turn left as soon as possible.

Move straight across the series of moving wallwalk panels, waiting for them to stop if necessary to avoid falling through cracks.

When you reach the end of the moving wallwalk panels, climb down and proceed through the passage on this higher level.

Upon entering the next area, gravity will shift.

From the starting position, head straight and turn left, then go through the box passage.

Kill any visible hunters above and move around the box you just entered to find another square passage.

Step through this passage to reach the actual floor of the room.

Clear the room of all hunters; the door will open once they stop spawning, and more hunters and a hound will emerge.

Before the door, look to the right for a wall-mounted monitor displaying a four-digit code; memorize it.

Step through the door and take rifle ammo from the mounted container on the right if needed.

Approach the touch screen monitor to the right of the door at the end of the room and enter the four-digit code.

In the next area, do not immediately step down from the platform; shoot any hounds or fodder visible below.

Jump down to the lower level and fight off the hounds.

Once the area is clear, locate the wallwalk and activate it via the touch screen monitor to its right.

Follow the wallwalk into the next area and use the touch screen to open a blue portal.

Step through the portal to end the level.

Sacrifices Mission: Move down the hall, clearing out mutilated humans and fodder.

At the end of the hall, find a monitor in the top corner of the wall and note the four-digit code.

Backtrack to the area where you first appeared in this level and locate the touch screen monitor.

Enter the four-digit combination observed on the monitor.

The square passage to the right of the monitor will open; crouch and walk through it.

On the walkway, you will encounter possessed children near a school bus.

Enter spirit form and climb the visible bridge over the canyon.

Use the touch screen monitor on the other side to open the passage at the end of the walkway.

Defeat the possessed ghost children that appear on the walkway and near the school bus.

Once they stop spawning, follow the walkway to the end, crouch, and go through the square passage.

Follow the hallways, finding a mounted leech gun station.

In a larger room, clear out spawning hunters, then hit the switch to activate the wallwalk.

Climb the wallwalk, attempting to kill the hunter that spawns just before he deactivates it; if you fall, kill the hunter, reactivate the wallwalk, and proceed.

Follow the deactivated wallwalk due to debris blocking the initially activated one, switch over through the gap, and go through the orange portal.

In the next area, clear out fodder and locate a round explosive object.

Push the explosive object near the blocked hole in the ground, step back, shoot it to clear the path, and fall down the hole.

Follow the path, turn right when forced to, and you will find a hunter in a pool of blood.

Tommy will retrieve the hunter's detached hand, which can be used to open hand identification doors.

Approach the hand panel on the wall near the door and use the hand to activate it.

Defeat fodder at the end of the path.

You will eventually overlook a fight leading to the Centurion boss battle.

Boss Fight - Centurion: The Centurion has heavy weapons, making the fight difficult.