Treasure Battle! is a Japanese-only Gamecube game released in 2002. The game's plot revolves around Rocky Hattari who has challenged Luffy and Straw Hat Pirates to a "Treasure Battle" to win their treasure. Luffy agrees to the challenge, the treasure in question is a card collection.
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Great underrated One Piece game. Super fun co-op experience and generally fun and unique concept for a multiplayer anime game.