One Piece: Treasure Wars is a board game for the Wonderswan hand-held based on the manga and anime series, One Piece. It was released on January 2002 by Bandai, the developer and publisher of the game.
In the game, the player chooses one of the Straw Hat Pirates and fights other members of the crew in the board game. The main goal is for the player to find the treasure or special item before his opponent does. Each player will run around the board fighting against other pirates. The members of the crew the player did not choose as his or her character will also be running around along with other enemies who the crew has to fight.
While sailing on the Grand Line, the Straw Hat Pirates are robbed of their Eternal Pose by a crow. They have no choice but to stop at a mysterious island nearby and replenish their supplies. After they dock at the archipelago Cream Mist, they learn about a tournament called the Treasure Wars (トレジャーウォーズ Torejā Wōzu?) hosted by the island's king, Cello. The goal of the Treasure Wars is to search for treasure called the Life Gems (ライフジェム Raifujemu?) hidden on the five islands of Cream Mist. Whoever collects all the gems and return them to Cello are rewarded with 100,000,000 and an Eternal Pose to their island of choice, so the crew decides to participate.