You have to get in detension
in the detention room
It it in the secret passage in the detention room on Big Nate Island.
Go to the right and click on the file cabinet cuz its a secret passage way and thats where you find the bell clapper
get the bell clapper
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.
In the file cabinet, in detention, in the school.
by the green cabnit and what is useful in the secret room is the bell clapper
you ring the bell with the claper you got in the secret room.
You need to click on the file cabenet and then go down the ladder.
The entrance to the secret room under the detention room is in the filing cabinet.
it is directly under he door. its got a handle
Artur is in the secret room behind the file cabinet. (He was hunting for the Time Capsule.)