in the file cabnit to get there you must make the stink bomb
The entrance to the secret room under the detention room is in the filing cabinet.
in the detention room
In the drawer cabinet in the detention room.
It it in the secret passage in the detention room 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.
In the file cabinet, in detention, in the school.
Go inside the file cabinet, go down to the secret room, and get the bell clapper. Before you go to detention, you have to open Nate's locker and get the blueprint showing the secret room.
You first have to get in the one locker all of the papers knock you back. Then you have to go to the giant pile of papers in front of the locker. You will find a map leading to the detention room secret door. Then you can get detention, set off the stink bomb, and go in the secret room.
Artur is a kid from Big Nate's school on "Big Nate Island". While searching for the lost Time Capsule, he became trapped in the "secret room" behind the filing cabinets in the Detention Room.
The blueprints to the Secret Room in the school are inside Nate's overstuffed locker. Use the combination (9305) that you find on the completed comic strip. To enter the secret room from Detention, you need the blueprint and the Stink Bomb, and, of course, the gum that gets you into Detention.
The stink bomb is used to get the teacher to leave the Detention Room. When you have the blueprint to the secret room (from Nate's locker), use the gum to get detention, then run the teacher off with the stink bomb so you can get to the file cabinet and then the secret room below. (see related question)
When You Go Into The Secret Detention Room And you jump down the Light switch is on the wall.