Official story and features:
"Darkness has fallen upon a once-magical land. An evil King who seeks to rule with an everlasting night has captured the creatures that inhabit this realm. Now, a young boy must use the powers of a legendary suit to control special eggs in order to restore light to the land.
Gamers will collect magical eggs, use them to solve puzzles and nurture them with items found while exploring the world. Gamers will be able to hatch the eggs and discover magical creatures with a variety of skills, introducing a strategic planning element to the combat and puzzles. Players will explore massive, colorful environments, each with their own missions and secrets, and then defeat the evil boss of each stage. It's up to Billy Hatcher to return light to the land!"
Story from Sega site
"- Use special eggs and the animals that hatch from them to solve puzzles, navigate a variety of environments, and defeat enemies
- Explore a vast 3D world with many huge stages to uncover secrets and find hidden items
- Tackle a wide range of unique missions for multiple gameplay experiences
- Battle with up to four players in split-screen play"
Features from Sega site