Sonic is back to save the world in his biggest adventure yet. The mad scientist Dr Robotnik had found a way to harness pure evil from the chaos emeralds and destroy the world. Joined by friends new and old, Sonic must keep Dr Robotnik from obtaining all 7 emeralds and unleashing Chaos on the world.

Sonic makes his debut to Dreamcast in a full 3D world of visual splendour, providing a thrilling gaming experience. Faturing signature high velocity action stages and adventure fields, Sonic's adventures are only just beginning!

-Stop Dr Robotnik raising a chaos monster

-Control six characters

-Unlockable secrets including 12 classic Game Gear titles

-The Chao minigame creatures from past Sonic games return

-For 1 player (2 players in Chao mode)