There is no door 4; there is another balloon down in the water area.
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There is a hidden door by the things on pedestals. look around for i think a dive hole or hidden door that has lights coming out of it.
you open up the door in the hidden lake
If you mean the one by the underwater cave you have to follow the squid on the first level of rescue the black puffle there is a squid follow it and you will come to a door which the key is hidden in.
In Garfield Scavenger Hunt 2, to keep the library secret door open, you need to find the hidden book that acts as a lever. Once you locate the book, place it on the designated spot to activate the mechanism. This will keep the door open, allowing you to explore the secret area. Be sure to search carefully, as the book can be well-hidden!
you have to do 350 battles. Finish the subspace emissary mode then go to the swamp level find a secret door in the area after giant diddy then defeat jigglypuff.