Nesoid (NES emulator)

Well, that’s exactly what Nesoid brings to the party by providing access to pretty much all the games (if you can find them) released for the original Nintendo console, including classics like Zelda, Donkey Kong, and Super Mario Brothers.
Nesoid is an emulator providing the facility to play NES games but none are supplied with it so you’ll need to download them from somewhere. Google for “NES ROMS” and you’ll find plenty of sites offering them up for free.