The New Labyrinth Zone! (Sonic The Hedgehog 4 Trailer)
This is what Sonic should be. I could never get the hang of the 3D games, and especially didn't like having a 3D plane on which to miss all the rings because of not being able to anticipate what direction they would come from while moving at a high speed. With a 2D platformer the player can focus on the speed and the jumps, which is what Sonic was originally made popular for.