User blog comment:PKMNthehedgehog/Generations, Your stage ideas?/@comment-1410665-20110922125517

Classic Era

 * Ice Cap Zone - Sonic 3
 * Regal Ruins - Sonic R (Remastered to Action/Adventure)

Dreamcast Era

 * Lost World - Sonic Adventure
 * Sonic Gunslinger - Sonic Shuffle (Remastered to Action/Adventure)

Modern Era

 * Radical Train - Sonic 06
 * Babylon Garden - Sonic Riders (Remastered to Action/Adventure)
 * Mad Matrix/Digital Circuit - Shadow the Hedgehog