To the best of everyone's knowledge can the Megadrive play all Genesis games and vice-versa? The reason I'm asking is because my Teradrive won't let me play Gunstar Heroes (Genesis). It gives me a screen display that says "Developed for use only with NTSC Genesis Systems".

Is this common when trying to play Genny games on a Megadrive, or is it a Teradrive exclusive problem? Does anyone have a Megadrive and a US copy of Gunstar Heroes so they can test compatibility across core systems?

Any help would be appreciated.

Who knows, maybe I can develop a mod to play region-free on a Teradrive Laughing

...most useless mod ever.