Enjoy this port while you can
Super Mario 64: Browser Edition is a modded port from the Super Mario decomp project (via github). It is a faithful rendition of the entire game that was once available on your Nintendo 64 cartridge, that you can now enjoy while at home or work on your PC browser.
The modders are not earning any revenue and are purely doing it for fun. But enjoy the game while you can, because the Nintendo’s legal department will inevitability try to shut it down. You can play it here.