Sonic Adventure

Sonic Adventure (ソニックアドベンチャー Sonikku Adobenchā?) is a platform video game developed by Sonic Team. It was originally released for the Dreamcast as a launch title in Japan in 1998, and worldwide in 1999. It was the first game in the main Sonic the Hedgehog series since Sonic & Knuckles in 1994.

After series villain Doctor Eggman releases an ancient monster, protagonist Sonic the Hedgehog vows to stop him collecting the Chaos Emeralds. The other playable characters are flying fox Miles "Tails" Prower, love interest Amy Rose, Knuckles the Echidna, who plans to reassemble the Master Emerald, angler Big the Cat, and E-102 Gamma, one of Eggman's robots.

Sonic Adventure received generally positive reviews for its graphics, gameplay, and soundtrack. It became the best-selling Dreamcast game. A sequel, Sonic Adventure 2, was released in 2001 for the Dreamcast. Enhanced ports of the game were released in 2003 for the Nintendo GameCube and Microsoft Windows. It has since been re-released as a downloadable game for Xbox 360 via Xbox Live Arcade, and PlayStation 3 via PlayStation Network in 2010. It is also included in the Dreamcast Collection for the Xbox 360.