This is why the phrase has become a popular search term. Users are hoping to find a legal, archived copy of the game’s ROM file hosted on this venerable site.

Downloading games you do not own is generally considered a violation of copyright law.

New Super Mario Bros. 2, a side-scrolling platformer developed and published by Nintendo, was initially released in 2012 for the Nintendo 3DS. The game is now available for free on the Internet Archive, a digital library that provides access to a vast collection of games, books, and other digital content. In this review, we'll take a closer look at the game and its availability on the Internet Archive.

I can provide a for whichever method you choose.