Sonic Adventure 2 is a 2001 platform video game developed by Sonic Team and published by Sega for the Dreamcast video game console. It was released in North America on June 19, 2001 and in Japan on June 23, 2001 to mark the 10th anniversary of the release of the first Sonic the Hedgehog game. It is the sequel to Sonic Adventure. It is the seventh chronological installment in the Sonic the Hedgehog series and the last to be released for the Sega platform. It follows the protagonist team of Sonic the Hedgehog, Knuckles the Echidna, and Miles "Tails" Prower and the antagonist team of Doctor Eggman, Shadow the Hedgehog, and Rouge the Bat and their attempt to work together in order to save the world from destruction.