I will say that my not beating Mario World is not for lack of trying. It was probably my most played game as a kid. I just sucked at games. I have it on my Wii U and will probably get around to attempting to beat it again. There's a specific place I always got stuck in when I played it. I know there's an alternate exit that I have to go to proceed after that point, but I couldn't figure it out as a kid apparently. I can't remember if I ever tried star road.

To be fair, the only platforming game from the NES/SNES days I've actually beaten is probably Donkey Kong Country. Like I said, I sucked at games.