Chapter 15

After dropping down the hole in the floor, look on the wall to your left for a ventilation duct covering.

Pull off the covering and enter the small room inside to find a Secret Orb. Interact with it to unlock the ‘Left Behind' Achievement.

Head into the room to the right from your starting location.

Find the lever in the center of the floor and the mind control device to its right.

In the background, you will see two pressure plates on the floor and a Zombie.

Pull the lever to open a door on the left in the background.

Jump to the mind control device from the nearby ledge to activate it.

Two Zombies will appear in the background and run in opposite directions.

Have the visible Zombie run to the left so the other Zombie exits the now open door.

Leave the mind control device and pull the lever again to close the door.

Return to the mind control device and hold the control stick in one direction so both Zombies run onto the walls on either side of the room, positioning them correctly to hit the pressure plates.

Have the Zombies run in opposite directions; they should hit both pressure plates simultaneously. Leave them standing on the plates.

Press downwards and jump to leave the mind control device.

Make your way through the now open door on your right to exit the room.

Head through the next area and climb the ladder at the end.

Follow the platform all the way to the right until you reach a rooftop with the letters ‘R' and ‘C' mounted on it.