You will need the blueprint from Nate's overstuffed locker to access the room. When you get detention, use the stink bomb to scare off the teacher. Now you can click on the file cabinet and go down to the secret room. (The bell clapper is hanging from the ceiling.)
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Details
The filing cabinet is behind the teacher's desk in the Detention Room. You need gum and a stink bomb. Collect all 8 comic pieces and give them to the comics shop guy (who will give you the frame for them). Assemble the comics and he will give you some gum.
Use the combination on the comic to open Nate's locker for the "hidden room blueprint". In the Science Lab, use the chemistry set to create a stink bomb (mixing and heating the yellow and blue chemicals).
Chew the gum in the hall and get detention. Use the stink bomb there to run the teacher off. The secret room is behind the filing cabinet, as shown on the blueprint in Nate's locker.
(Note : if you don't have the blueprint, you cannot access the filing cabinet. Go outside and get it, then simply re-enter the detention room - stink bomb is still there).
In the file cabinet, in detention, in the school.
what island? just look up a written walkthrough for whatever island you are stuck on.
It is used in detention, so as to be allowed near the file cabinet.
Artur is in the secret room behind the file cabinet. (He was hunting for the Time Capsule.)
Get detention Set down stink bomb Click file cabinet
you set off the stink bawlm mix yellow and blue and heat it
you have to go to the file cabinet and then your bell thing is in the air you don't have to talk to the other kid then.........
Because you need to get the map from the locker before you can g down.
Go to the right and click on the file cabinet cuz its a secret passage way and thats where you find the bell clapper
You get to it by using the stink bomb you made in the science lab.
Chew bubble gum to get in detention. Use the stink bomb to make the teacher leave. You can then go over to the file cabinet to go downstairs.
in the school basement. get the gum, chew it in school, go in the file cabinet on the ceiling