King's Castle is a location seen in Freddi Fish and the Case of the Missing Kelp Seeds.
King Crab resides in this castle along with two guards.
The castle appears in all versions of the game, but it is only important in the King's Castle storyline.
In the King's Castle storyline, the message bottle is on one of the pearl stands in King Crab's throne room, but King Crab likes the bottle so much that he requests something with similar quality to the bottle. After Freddi and Luther give King Crab a pearl, he will let the kids have the message bottle.