Sonic Reunion is a fan game based in the Sonic the Hedgehog universe, produced by Lunatic Entertainment. It serves to unite numerous characters, old, new and obscure, as well as those separated through time and space. Levels spanning the series also show up. In addition to this, nearly all characters in the game can be unlocked to play at least a minor scenario with, with the exception of K2 Lou (although you can unlock his parents in his stead) and a few other very minor characters (Omochao, Dark Omochao and the ghost of Great Battle Kukku 15th).