This walkthrough is for the Pink Key.
Grab the Pink Key from the podium drawer. This key will unlock a door in the bulding where there is the Theater. Go to the building from the side where you pass the Gym on your left. When you head inside the Theater Building you will be presented with an hallway, go to the end of it then turn left and go down the second one. You will see a pink door with your name on it, inside, the stairs will lead you to the lower floor of the main building of the school.
After going down turn right you can see a vent, crawl through it and you are presented with a pink door on the right, it's closed for now, continue down to the room and then to the corridor.
Head inside the second wooden door in the corridor, you will find the Bee Keeper's Hat on one of the beds.
head inside the white door and follow the vent "road", you will reach a room with a outside with a white door on the left and two windows on the right, one is broken, you can crawl through it and open the pink door.
Now with the Bee Keeper's Hat you can go back to the fence area where there is a chicken, it's next to the gym green's door. Open the first gate put on the Bee Keeper's Hat then open the gate up ahead – the bees won’t attack you with the hat on. Run over to the left and open the next door. Unlock the door to the left. This will free the chicken inside.
Toss the Bee Keeper's Hat head back to the Pink Room when you go down the stairs turn left open the first door on the left and get the Chicken Foor.
Now comes the hard part, you have to go back to the "ranch" and put down a trail to get the chicken to the second pink room, you have to remember two things, the chicken is scared of you so if you get too close it will run in the opposite way, pay attenction to the nun's footstep if she is coming hide somewhere or run. The chicken can see food through the walls, it needs only to be in range to aggro it.
Once the chicken is in the room, close the door and block it again with the wooden plank, lay down the ramp on the energy machine along the right side of the room and put chicken food on the button that is on the machine.
Now you can play the minigame, you have to get a score of 150 points. The pumpkins are the only ones that give you points, the clock gives you more time avoid the cat and dog since shooting them will lower your score. The game is INCREDIBLY forgiving, so it shouldn't be hard to get to 150 points.
Grab the Mask Piece from the opening wall, return to the bunker and place the mask piece on the mask podium as usual.

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