12. Sonic Adventure 2 Battle
Cheat: Green HIll Zone
This non-cheat Easter egg is worth checking out but will take some time and patience. Sonic Generations did a lot to reunite gamers with several classic Sonic levels, but Sonic Adventure 2 Battle has a remarkable 3D model reinterpretation of Sonic's very first level on the Genesis, Green Hill Zone.
Again, getting the Green Hill Zone remake is quite a task. You have to collect all 180 emblems in Sonic Adventure 2 Battle. Trust us though, it's worth it.