Hyper Sonic, the golden super form from Sonic 3 &Knuckles, is not featured in Sonic Generations. The game focuses on Sonic's classic and modern forms, with different gameplay and abilities for each.
Tässä ovat Sonic Generationsin pelattavat muodot:
* Classic Sonic: Plays with 2D platforming gameplay, similar to the Genesis games.
* Modern Sonic: Plays with 3D platforming and action gameplay, similar to the later Sonic games.
Vaikka pelissä on "Super Sonic" -muoto sekä Classicille että Modern Sonicille, se aktivoidaan keräämällä tarpeeksi Chaos Emeraldeja, eikä se ole sama kuin Hyper Sonic.