This is the seventh level in Co-op mode of Portal 2 and the sixth level in the course. This level doesn't take place in a normal testing area and it doesn't contain any exits. It also introduces the players to the Circuit Breakers.
Walk along the catwalk and stop just as you are about to pass a wall. Shoot a portal to the wall and place the other portal over to the bright small room behind it.
2
Go through the portal and proceed to the room with the CD player. Then go to the room with the two Circuit Breakers and go stand in front of them. Use the Breakers simultaneously (the Timer ping is very useful in these situations).
3
Fire a portal through the door and place the other one on the wall next to you.