Try to become a master breeder in MONSTER RANCHER BATTLE CARD GB. You must travel around the world and challenge other breeders to a card game. Both contestants have a team of monsters, and the cards act like attacks on the monsters. If you win a match, you will earn more cards. When you collect all 100 cards and win all of the license matches, you will enter the ranks of the master breeder in MONSTER RANCHER BATTLE CARD GB.