User blog comment:PKMNthehedgehog/Generations, Your stage ideas?/@comment-1669199-20110921004037

My ideas would be:

From Sonic Rush: Either Leaf Storm or Dead Line

Sonic Rush Adventure: Blizzard Peaks, Coral Cave, Sky Babylon, or Plant Kingdom

Sonic & the Black Knight: Camelot Castle (assuming Storybook games count)

Sonic 2006: Wave Ocean, Kingdom Valley, Crisis City, or Aquatic Base

Sonic Colors: Starlight Carnival

Sonic Unleashed: Eggmanland