im literally losing my mind here sonic the Hedgehog (Sega Genesis / Mega Drive, 1991) has a hidden level select.
On the title screen (with Sonic in the emblem), press Up, Down, Left, Right. If you did it right, youll hear a chime. Then hold A and press Start.
instead of starting at Green Hill Zone, you get a menu listing every zone and act, plus a sound test. perfect for playing your favorite level or practicing a hard act. its not a cheat in the online sense at all, its a classic built-in developer menu.
