Legend has spent years making Portal for the N64 and by Gaben he's done it
pcgamer.com
Several years ago PCG reported on the early stages of a project by programmer James Lambert, who really loves the N64 and decided for the hell of it to make a version of Portal that runs on hardware first released in 1996.
Well, Lambert is clearly the type of chap who commits to something and then follows through, because he's spent the time since then continually adding bits and bobs and now has something which, to my admittedly uneducated eyes, is the most impressive homebrew game I've ever seen.
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Seeing as there's zero Nintendo IP being used, I find that unlikely. The only company that would have any standing to go after him is Valve, and they historically don't go after modders and such. You also need to own a copy of Portal to play this game. You basically patch a file in Portal with a bps patch that will "convert" it into a playable N64 ROM.
What they need to do is get the licensing worked out and release it via gamepass or something. That would be a nice windfall for him and share this with with others.
Valve has been known to make fangames based on their IP available through Steam. Black Mesa is a good example.
Of course, this would have to be distributed with an emulator, but N64 emulators don't require any proprietary code to run.