One Piece Grand Battle! Rush is a fighting game based on the One Piece manga and anime, released for the Nintendo Gamecube. It adapts elements of the series up to the Whisky Peak Arc. Developed by Ganbarion and published by Bandai, Grand Battle! rush was released in Japan on March 3, 2005,

Combat uses typical 2.5D mechanics, with three-dimensional character models interacting on a two-dimensional axis. Player characters can walk, run, jump, double-jump, crouch, block, and grab (as well as throw and catch) items around the battlefield As in most fighting games, health is standardized among characters, while the main combat attributes - Offense, Defense, and Agility vary heavily, from a scale of A through E. These variations generally reflect the characters' canon abilities; for example, Luffy is ranked A in Offense and C in Agility, while Usopp is ranked E in Offense and A in Agility.

Fighting consists of standard button combinations. Each player character can access around 20 standard techniques, along with several Finisher techniques that feature full cinematics. Finishers can only be used when character health falls below a set threshold (marked in notches on the health bar), and follow a numbered level system; higher levels correspond to lower health, and usually greater damage.