Based on Wizards of the Coast's Duel Masters card-battle game, this GBA cartridge has players competing in trading-card duels as they progress though an RPG-style story. The game begins as the player's character inherits a valuable Duel Masters card from his grandfather, but then loses it to a mysterious thief. The quest to recover the heirloom leads the hero through many Duel Masters battles, in which he gains experience and power with each victory, to ultimately vie for the title of "Kaijudo Master." The Duel Masters franchise enjoyed notable popularity in Japan in the months leading up to this GBA game's North American release, spawning a comic book and animated television series there.