The blueprint to the secret room is in Nate's locker (along with a million other things). The locker combination is 9305 and the blueprint will show the location of the door behind the filing cabinet in Detention. The room below has the missing bell clapper for the school bell. You need the locker opened or the filing cabinet won't open up.
On 24 Carrot Island, the vent diagram is in a window near the roof. On Big Nate Island, the school blueprint is in Nate's locker. The secret map to the Time Capsule is under a rock on Seal-Saw Island.
It is in Nate's overstuffed school locker, second floor of the school. The combination is 9305 (entered vertically), which you learn from assembling the comic book pieces. The blueprint shows there is a secret room behind the Detention Room.
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.
Among the tons of junk crammed into the locker is the blueprint to the school. It shows the secret room behind the filing cabinet in the detention room. (see related question)
It is behind the filing cabinet. You must open Nate's locker on the second level. Pick up the blueprint from the pile in front of it. (see related question)
a school blueprint. get the combanation on the FINSHED comic.
You can't access the Filing Cabinet unless you have the Blueprint showing where the secret room is. Use Nate's combination to open his locker, and get the blueprint from the pile of papers. Now you can access the room below the filing cabinet.
If you have gotten the blueprint by using Nate's locker combination at his locker, you can open the filing cabinet and enter the secret room. The missing bell clapper is hanging from the ceiling.
Chew it in the school and you will get detention. This is how you get to the secret room shown on the blueprint in Nate's Locker. Open Nate's overstuffed locker at school, and get the blueprint. Go to the Science Room and make a stink bomb (mix yellow and blue then heat it). Now when you chew the gum and get sent to detention, you can use the stink bomb to run off the teacher, and use the blueprint to enter the secret room behind the filing cabinet. (There is a light at the bottom.)
in the cabinet on big Nate island
The "blueprint" in Big Nate's Locker (combination 9305 is on the comics) shows the location of the "secret room" in the school. It is in the Detention Room, behind the filing cabinet. To get there, you will need the gum and the stink bomb. Chew the gum, use the stink bomb, and go behind the filing cabinet. (see related question below)
You have to put together the comic strip. There is a secret message across the middle (Nate wrote his locker combination on it). Once you have the comics, go to the locker and dial the combination. After the mess settles, click on the pile to retrieve the blueprint.