Instructions
Build up points by knifing as many zombies as possible in the early stages. After acquiring 3,000 to 4,000 points, exit the first room by the door at the top of the stairs.
Continue forward, make a left and open the double doors, which leads down to a large room with two staircases.
Add more points by killing zombies for another level in this room. Open the next door, make a left and open the door that leads straight into the back stage.
Proceed to the farthest part of the stage; the switch is located on the left wall. Pull it to enable power to flow throughout the entire level.