Play as Super Sonic or Hyper Sonic in the Sonic 1. 5cw6q

To unlock Super/Hyper Sonic, you can collect all of the Chaos Emeralds, or select an option on the title screen to enable them from the get-go.

To TRANSFORM, you jump with one button, and then press a different one while in the air. This will turn you Super. Doing it again will turn you Hyper, and doing it yet again will revert you to normal.