You find it in the book room. It will be at the end of Rockhopper's book.
you find th key in puffle rescue with black puffles and go for the shadow
just drag the key to the door and click and let go
You find the key from the book room in Rockhopper's book.
the last key to the the left
If your talking about captains quarters go to the book room and at the end of ROCKHOPPERS JOURNAL there`s the key.
go into the black puffe follow the squid and u get the key in that room
The answer is KEY.
under the door mat
find a key
Push the "e" key then the "m" key.
Find the key
There is no key for that door. You're not meant to go through it. There's an alternate route you need to find.