Monster Rancher 2 can unleash hundreds of monsters from your common household CDs. That's right-you can actually use this game software to spawn unique monsters from any CD you own-music CDs, PC software CDs, or even other game CDs. EVERY CD YOU OWN CONTAINS A MONSTER that you can unleash into the world of the Monster Rancher 2, and then nurture and raise him (or her) to be the ultimate fighting machine.