Only Monster Rancher battle cards let you use the music and game CDs you already own to unlock hunderds of additional hidden cards you can use to battle your opponents. Join Colt, Master Pabs, Cue and the entire Monster Rancher gang as they journey to magical islands to collect cool trading cards, practice their skills and battle with the wacky, outrageous characters they encounter along the way. Advance through the action-packed schedule of official battle card tournaments to earn the coveted rank of Master Class Breeder, and you'll be among the elite.