Complete the Hero storyline to unlock Shadow The Hedgehog, Rouge The Bat, and Cream The Rabbit. Complete the Babylon storyline to unlock Eggman. Complete Storm's, Wave's, and Jet's missions to unlock AiAi, Ulala, and NiGHTS. Complete 100 races to unlock E-10000G. Alternately, accumulate over fifteen hours of game play time. Accumulate over fifty hours of game play time to unlock E-10000R.