 The game features three modes of gameplay . The first two are story modes that feature either Sora or Riku , and the third is a two player battle mode . Initially only Sora 's story mode is available ; once completed , " Reverse / Rebirth " mode becomes available . Reverse / Rebirth allows the player to play a second story mode featuring Riku and a link mode where players can battle each other via a Game Link Cable . 
