See the edit. And please name games that don't scale past dual cores.
Here is FF and Spotify, non-games that have more than 2 threads, so scale past two cores (though how well it scales is an entirely different matter, and numerous threads != better core scaling, I am just showing this as FF definitely scales past two cores).
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I think even Risk of rain scaled, and that's a tiny game that looks like this:
Though I can't guarantee that as I don't have it installed anymore (screenshot is one of the top Google results).