Seed Propeller

The Seed Propeller is an item used by Modern Sonic in the Nintendo 3DS version of Sonic Generations. It is located in Mushroom Hill Zone, the 3rd Sonic Generations Act

Sonic Generations
The Seed Propeller was used in Mushroom Hill Zone act 2, (which was based off of the 1st Sonic and Knuckles' (or Sonic 3 and Knuckles' 7th act) act with the same name.) It would lift Sonic in the air, which was not a mechanism used in the original Sonic and Knuckles.

Trivia

 * Sonic Generations (3DS) is the only Sonic the Hedgehog game to use this mechanism, as it wasn't used in any other game (like the original) nor the Archies