Sailor Piece: How to find all six ancient pieces

Sailor Piece players can unlock Dungeons by collecting six Ancient Pieces, which are hidden jigsaw pieces required by an NPC on Dungeon Island after reaching level 5,000. These pieces must be found in a specific order across six islands: Starter Island, Jungle Island, Desert Island, Snow Island, Shibuya Station, and Hollow Island. After collecting all six Ancient Pieces, players must defeat 25 bosses to officially unlock access to the game's Dungeons.