Before you go in detention, go to the Science lab and make a stink bomb : mix equal parts of blue and yellow and heat until it's green and smoking. You also need to use the number on the comic strip (open Nate's locker to find the school blueprint).
In detention you have to set off the stink bomb to make the teacher go away. Then go into the file cabinet and access the secret room.
(see related question)
in the detention room.
drop the stink bomb
chew it in school and go to detention
To the detention room but you have to get gum to chew on but not from the poptropica store
It it in the secret passage in the detention room on Big Nate Island.
Chew the bubble gum
in the detention room
you have to get detention with the bubblegum and then use the stink bomb in detention.
in the detention room on big nate island
it is in the drawers on the right bottom two drawers
Go into the school, by the detention room, then chew it! That's how you get into the detention room! Hope this helped!
In the file cabinet, in detention, in the school.