In one of the mini rooms, there‘s a picture that drops your sanity instantly. It‘s supposed to be like that. Just don’t enter this room.
You can get a rusty knife artifact, if you go through the keep locked door next to one single locker, but you need Mr. Cleany-Clean or Headteacher to open that door, if you don’t have the black key artifact. Just place trash infront of the door, and Cleany might open it for you. Then, you will be able to enter a mini room with two doors, one left and one right. Go through the left door. This leads you to a garden area. Just go further and you will see two lockers. Open the left locker with a lockpick and you will find a rusty knife when you search it.
To get the belt, go back to that keep locked door next to the one single locker. Equip the rusty knife, but don’t let Headteacher, Viktor or Mr. Mix see it. They will get really mad. Now go into that mini room and open the right door with the rusty knife equipped. You should come into a rust labyrinth. In the middle of it, there’s the belt, but watch out for Freek’a’delka, it can instantly kill you. Just listen for squeaking metal noises. If you hear them, be careful. If they get really fast, then run. Once you’re around a corner, Freek’a’delka will loose you. When you found the belt, put the knife in there by pressing and holding TAB. Then hold MMB and press Alt, and the knife should be in your belt. After you did that, get killed by Freek’a’delka.
It’s not the best, but it‘s the only map we‘ve got for math level right now. Language map is way more detailed.