by the green cabnit and what is useful in the secret room is the bell clapper
When You Go Into The Secret Detention Room And you jump down the Light switch is on the wall.
You have to get in detension
in the detention room
on top of the lighthouse
there is a light switch next to the ladder click on it and it won't be dark any more
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.
Al the way 2 the right of the island
on big nate island, in the air, next to the light house
It needs to be dark
you ring the bell with the claper you got in the secret room.
you use it to turn the light on the lighthouse