This is a Commodore 64 port of the 1985 game SUPER MARIO BROS. for the Famicom and Nintendo Entertainment System. It contains the original version that was...
Sadly, it was taken down by Nintendo according to this article.
Discovered from this video from Modern Vintage Gamer.
I once played the C64 version of regular Mario Bros. It was a surprisingly good port.
That’s because it had the actual source code of the original NES game. So physics, and everything besides graphics and audio were 1:1.