Well go into the school and start Chewing Gum, the princpal will get mad and take you to detention, then use the smelly stuff to get her out of the classroom and then click on filing cabinet and you find a hidden room with the clapper inside:)
The entrance to the hidden room is in the second drawer of the filing cabinet. You need the blueprint from Nate's locker to access the room.
Find the crowbar-like thingie.
at the playground on big Nate island
It is in the secret store room behind the filing cabinet in the detention room on Big Nate Island. You need the blue prints from Nate's locker in order to access the secret room.
There is an electrical "breaker box" down below the ladder. A blue hand will appear when you roll over it.
in the middle of the girls on the playground!
in the detention room.
You have to make a stink bomb.
you climb up the rope
out side the school
The clapper.
drop the stink bomb