Journey into a whole new world in Monster Rancher 4 as your raise and train up to five of your favorite monster at one time! Pit them against other monsters or let them be your guides as you embark on exciting adventures and explore fantastic new lands! Only by working together will you and your monsters overcome the challenges and enemies along the way. You can also unlock hundreds more hidden monsters by popping in your favorite CDs, DVDs, or Games! The possibilities are endless - a monstrous adventure awaits you!
Source: Back of the box