Might be a stupid question.. I've seen people using Mario Bros. / Duck Hunt for runs before but never seen anybody use the one with World Class Track. Is it valid for runs? Idk there mightve been an update that came with it or something

I think Darbian used to use it in some of his old runs. Doesn’t seem illegal but then again I’m not an expert

Yeah it’s legal. Top runners like darbian and averge11 have submitted runs using it

It's an accepted cart/ROM.

Yes its legal lekukie even uses it

Totally fair question! Yes, it's valid if gameplay's identical.

Just because everybody already answered the question,yes you can