Sonic Mania, in old-school Genesis fashion, features a secret Debug Mode and Level Select that players can enter into whenever they want from the title screen. If you’re not familiar, Debug Modes ...
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 ...