its in the book room where the books are in the back of rockhoppers diary
hope i helped, my penguin name is mong2009
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The key is hidden in the bookroom the book shelf. It is at the back of the book "Rokhopper and the stowaway". Use the key to get into rockhopper' ship.
In Rockhopper's ship. There is a key you have to find before you are able to go inside it though.
You Go to rockhopper's ship and then you go downstairs of the ship and there will be a room and it will let you in only if you have the key.
The key is hidden in the bookroom the book shelf. It is at the back of the book "Rokhopper and the stowaway". Use the key to get into rockhopper' ship.
it is in the book of rockhopper in the book room