I need to make sure the information is accurate and stays within legal boundaries. Mention that using emulators without owning the original games isn't legal, so it's important to highlight legal alternatives. Also, mention fan games as non-commercial, created by enthusiasts.

Let me structure the article accordingly: introduction, official releases on PC (which are limited), legal access methods, fan projects, cultural impact, and conclusion. Make sure to emphasize legal and authorized ways. Maybe include examples like Switch Online + Expansion Pack 2 which includes some 2D games.

Double-check the current available games on PC. Mario Kart Tour was a mobile game, but nothing from the main Mario series on PC. The user might have heard about a hypothetical "Super Mario 2D Universe" collection, which doesn't exist. So the article should clarify that while there's no official PC-exclusive 2D Mario collection, there are ways to access existing 2D games through legal means.

Alright, that's a plan. Now, structure the article with these points, ensuring accuracy and legality. Avoid mentioning piracy explicitly, focus on legal options and fan projects.

First, I should clarify the scope. The user mentioned "download PC exclusive," but Mario games are mostly on consoles. Are there PC versions of Mario games, or are they using emulators? I need to be careful here. If it's an emulator, that could be a sensitive topic legally. Maybe the user is referring to legally available ports or remasters?