Dissidia: Sonic Alliance is a fighting/role-playing fanmade game, being the next installement of Dissidia franchise; it will be created by Sega, with cooperation from Square-Enix (the creator of the original Dissidia game; Dissidia: Final Fantasy), and published by Fantendo for PlayStation Portable. The game is set to be released on 23 June 2011, as one of the games to celebrate Sonic's 20th anniversary.