The Dreamcast version of Sonic Adventure 2 had official DLC that was available from the game's website. This DLC includes the menu themes that would later be added to the Battle edition of the game, three kart racing tracks with karts exclusive to those tracks (Sonic's special kart, the Eggrobo, and Opa-Opa from Fantasy Zone; the first two are unlockables in the Battle edition), and Halloween and Christmas-themed character skins for two-player mode.