Chili Dogs. Dr. Robotnik. Spin Dash. Death Egg. All things forgotten in the history of Sonic, and all things that make their return in Sonic Generations.
Sonic Generations begins, aptly enough, with classic Sonic playing through a new stage based on the original first Sonic stage: Green Hill Zone. Sure enough, there are all sorts of enemies like Motobugs (lady bugs on wheels) and Choppers (piranha bots that bite at Sonic while he crosses a bridge.) Sonic runs through a two-dimensional plane through the entirety of the stage, and with just the press of a button (or the traditional down + the jump button) he can charge up a spin-dash and take off.