Players choose a One Piece character and fight opponents in side-view arenas. The objective is to reduce the rival's life gauge before the time limit expires, using normal attacks, movement, defense, and character-specific techniques.

The single-player game advances through a sequence of battles, while versus play allows direct matches. Success depends on learning attack reach, controlling distance, avoiding damage, and using openings to apply stronger moves. The WonderSwan's small control layout keeps the command system relatively compact.

Stay close enough to punish missed attacks, but avoid repeatedly attacking without defense. Short attacks are safer for testing an opponent's range than immediately committing to a special move.

Watch the life and time gauges together. When ahead, prioritize blocking and positional control; when behind, take calculated risks only after creating a clear opening.