you need to find 4 fuses

1. hanging from a hook on the celing (you can jump to grab it from the fg42 wall buy catwalk
2. in the sink full of water in the bathroom next to the galaxy window
3. in the library on a shelf (electric cherry room)
4. is either in the outside area with mule kick or in the cafeteria (cant remember which, took me one try)

once you have fuses run around the map and find altars, place the fuses in each altar (only one fuse can be charged for each altar) you need to get kills near or in the same room as the fuse youre charging

once they are all charged take them to the wardens office (has the green spores in it) and place the charged fuses in the fuse box (its literally right next to you on your left as soon as you walk in)

the door should then open and you have access to PaP

unsure about the ray gun though

overrall great map

p.s

the door that opens is behind the wardens desk. there also parts you can collect to build the blundergat upgrade station and something else