Beats the hell out of the GBA port of Sonic 1. Example, this one is playable. They should have used oldskool early 90s Sonic on the cover, it would have sold more that way.

Complete all 7 special stages by collecting the Chaos Emerald at the end. Then enter any level, collect 50 rings, and press the Square button or Triangle button to transform into Super Sonic.

On the title screen, press 'Up, Down, Left, Right' on the d-pad. You will hear a chime. While holding the button that is the Genesis A button, press start. Go into the options menu. From there, play ...