Nintendo has not released a game officially titled "Super Mario 2D Universe" for the Nintendo Switch, nor have they published it for PC. As a general rule, Nintendo does not release its first-party titles on PC (Windows or macOS), keeping their iconic franchises exclusive to their own consoles to drive hardware sales.
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Legitimate versions have historically been hosted on community forums like the WohlSoft Forums Mario Fan Games Galaxy (MFGG) Nintendo has not released a game officially titled
Some users have reported that the physics can feel "floaty" or different from official Nintendo titles, and controller mapping (such as with a Pro Controller) may require manual adjustment. Download Safety & Availability Official Sources: super mario 2d universe download pc exclusive