This puzzle room is located in Rainbow Reef, marked on your map as a sunken pirate ship. If you’re doing the 'Comic Relief' quest, one of the blue crystals is also found in this puzzle room.

There are ten shogi puzzles you can complete in Pirate Yakuza in Hawaii, and they are a great way to earn lots of points that you can spend on treasure, new Goro Pirates crewmates, and more.