One Piece: Legend of the Rainbow Island is an action and role-playing game for the Wonderswan Color developed and published by Bandai on September 2001 and handheld and based on the manga and anime series, One Piece.
The storyline of the game is based upon the Alabasta Saga. The Straw Hat Pirates finds a new companion who uses a boomerang as his weapon. The Straw Hats along with their companion must fight the Baroque Works and save Alabasta from the evil clutches of Mr. 0.
In the game you choose up to 3 characters to fight in a square field where the character chooses an attack and which enemy to attack, each character has a different unique attack.