From the back of the game case:
Creatures, their lives are in your hands! Raise thousands of Creatures--Collect and trade them with your friends. Hatch Creatures from eggs & raise them to adults. Creature toys: teddy bears, spinning tops, punching bags and more. Feed them when they're hungry, heal them when they're sick. Three huge worlds to populate and explore. Each Creature has its own unique personality. With digital DNA, parents pass characteristics and behavior to their kids.