User blog comment:AYET/A Game of Numbers - Intro/@comment-2226235-20150605073002/@comment-24287735-20150605121658

The Thriller Bark is the only one island that is converted into a ship purely sailing at sea. It has two mansions, one used by Hogback and the other by Moriah. There are three masts on the ship and finally, they are led by the Mysterious Four.