In this map, you turn on the power the old-fashioned way :
Just follow the electric arrow painting until you come across the power switch.
First you need to open the door left to the stairs at spawn, next enter the room and open the door on the left. Go down the stairs, open the basement door and go all the way down to the Boiler Room, the power switch is in front of the teleport link pad.
To the right of a teleporter, there are 2 levers by default and one that you can build during the Pack-A-Punch opening puzzle.
Moving some levers leads you to teleport to a different area, which are shown by the image on the green screen.
After you've chosen your destination, you'll have to activate the main frame and initiate the link pad, exactly like in Kino Der Toten.
Now all you have to do is get into the teleporter and activate it.
Opening the Pack-A-Punch is really fun to do in co-op, but can be quite annoying to do solo because it will require you to backtrack a lot.
In order to open Pack-A-Punch, you will first need to alter the teleporter destination, and then teleport a first time in order to find 2 pieces : a lever and a fuse.
Change the destination of the teleporter to Basement (Sphinx) and teleport.
Once you've teleported, you should be in the basement, you will first need to look for the lever which can be at several locations in the basement.
After some time you'll be teleported in a bedroom for a few seconds before going back to the school, that's where you want to find the fuse.
The bedroom can either be clean or messy, so if you can't find the fuse, it means that you're in the wrong version of the bedroom, and you need to crouch in front of the shiny hole in the wall in order to switch location (in co-op, there should be at least one player in each version of the room)
Then you need to teleport once again to build the fuse into the machine at the back of the basement.
Now you can build the 3rd lever by the green screen to unlock the Pack-A-Punch. All is left to do is select that location and teleport, tadaaa you're at the Pack-A-Punch.
To build the shield on this map, you'll need as usual to find 3 parts.
The difference on this map is that each part don't have a set area where they can spawn in, they still have 3 locations each, but they can spawn pretty much everywhere.
To fill the gobble gums machines, you'll have to find a box of candy that can spawn at 4 locations around the map.
At the entrance of Greenhouse Building
At the Dining Hall
At the Student's Residence in front of Widows Wine
In front of the radio room at Gardens