I was wondering if anybody knows why this game doesn't play in most emulators: https://www.romhacking.net/hacks/1518/
I thought it was a glitch in the patch itself, but I finally got around to testing the "Super Mario Bros. (W) [!].nes" patched rom on the RetroPie and it does work, but only with the lr-fceumm emulator. It doesn't work with lr-quicknes or lr-nestopia. It also doesn't work with NestopiaX or MednafenX on the XBox either.
Everything seems fine when you start playing it but whenever you hit a question block with a mushroom in it the game will either totally freeze or reset, depending on the emulator used. Maybe it has something to do with the SMW3 mushroom sprite being used?
LOL.. I didn't know until 2 minutes before writing this what the mushroom looked like. I didn't think I'd ever see it in this hack.