Mushiking: The King of Beetles (Konchu Ouja Mushiking) is a GBA adaptation of the massively popular Japanese arcade card game by Sega. It combines beetle collecting with Rock-Paper-Scissors style battles. Players take on the role of a young protagonist who must collect various beetle species and battle cards. Combat is strategic, requiring players to predict their opponent's moves to execute powerful wrestling attacks. The game features an RPG-style story mode where you level up your beetles and progress through tournaments to become the Greatest Champion. It's a unique blend of nature simulation and competitive strategy.