The entrance to the secret room under the detention room is in the filing cabinet.
in the detention room
In the file cabinet, in detention, in the school.
use a stink bomb to get the teacher out of detention.Then click on the second and the third drawer
In The Detention Room
When You Go Into The Secret Detention Room And you jump down the Light switch is on the wall.
Get into detention by chewing bubble gum then use the stink bomb to get the teacher out of the room and go down the file cabnet on the right
Big Nate IslandThe secret room is under the detention room, and can be reached through the filing cabinet.Astro Knights IslandMordred's secret lab is underground, with a locked entrance under the hay bales.(see related questions)
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.
when your in the detention room to get the teacher out.
Go into the school, by the detention room, then chew it! That's how you get into the detention room! Hope this helped!
get all the pages for the comic book open the locker get the gum and chew it right in front of the detention room