One Piece: Treasure Battle! is a party game starring characters from the One Piece anime and manga series. The Straw Hat crew meets the reporter Rocky Hattari and agrees to compete in a Treasure Battle. In the Scenario mode, the player can choose between four difficulty levels.
The player will compete in a series of mini-games, including:
Treasure Battle – two teams fight over a treasure chest and have to get their ship to pick it up;
Battle Royal – the teams have to beat each other up scoring a point when the opponents' life bars reach zero;
Kung Fu Survival – the team that beats up the most seals wins;
Teamwork Rally – a chest must be passed between team members;
Cross Country – a race with sub-stages in which the players will race individually. The final position is determined by the results in the sub-stages;
Pirate Soccer – the teams play soccer with a gigantic ball;
Treasure Hunt – players wait until an arrow appears directing them to a treasure chest.