
Sonic Adventure is an HD version of Sonic Adventure DX: Director's Cut. It was made available on Xbox Live Arcade and PlayStation Network. Certain elements from the Director's Cut, such as the playable character Metal Sonic and the extra 60 missions, were omitted from this release and instead offered as downloadable content.
Dr. Robotnik is determined to find a new method to overcome his arch-rival Sonic and take over the world. In his studies, he discovers a being known as Chaos—an entity that, long ago, helped safeguard the Chao and the mighty Master Emerald, which maintains the balance of the seven Chaos Emeralds. When a group of echidnas attempted to seize the Emeralds' power, disrupting the harmony between them and the Chao, Chaos responded by harnessing the Emeralds to transform into a colossal creature, Perfect Chaos, and annihilated them. Before it could devastate the planet, Tikal, a young echidna who had formed a bond with Chaos, sealed it away within the Master Emerald—along with herself. Now, Eggman has freed Chaos, and Sonic and his allies must stop Robotnik’s schemes and keep the monster from gaining even more strength.
| X360 | September 15, 2010 |
| PS3 | September 20, 2010 |



