It's up to Sonic and his pals to save the world from the evil Dr. Eggman...

It's up to Sonic and his pals to save the world from the evil Dr. Eggman, who has returned to once again try his hand at world domination. The evil Doctor's scheme is to steal the seven Chaos Emeralds and raise the all-powerful Chaos monster to do his bidding. Entangled in the plot of the sinister Dr. Eggman, Sonic must enlist the help of his friends Amy, Tails, Knuckles and Big to foil Eggman's every move.

The original Sonic Adventure returns with enhanced graphics and more than five hours of new gameplay, including an all-new Mission Mode featuring more than 50 missions and hidden surprises for gamers to discover.

Special Features:

• Six playable characters each with his/her own skills and abilities.
• Thirty massive levels, over-the-top boss battles and mini-games featuring the one-of-a-kind Chao AI characters.
• All new Mission Mode, allowing gamers to discover exclusive items and unlockable secrets, including hidden classic SEGA Game Gear titles.