Sonic Adventure 2 (ソニックアドベンチャー2, Sonikku Adobenchā 2^?) is a video game developed by Sonic Team USA and published by Sega in 2001 as a part of the Sonic the Hedgehog series and is the sequel of Sonic Adventure.

The game was released in North America on June 19th, 2001 and in Japan and Europe on June 23, 2001 to mark the 10th anniversary of the release of the original Sonic the Hedgehog. This game introduces two new playable characters, Shadow the Hedgehog and Rouge the Bat, and is

also one of the few Sonic games to officially feature Doctor Eggman as a playable character. It is also the first game in which the latter character is wholly referred to as “Eggman” in the West, and the “Robotnik” name was adopted in Japan for other related characters.

Following shortly after Sega’s departure from console manufacturing, a port of the game called Sonic Adventure 2 Battle was released onto the Nintendo GameCube in Japan on December 10, 2001, followed by North America on February 12, 2002 and Europe on May 3, 2002.