Several free resources for New Super Mario Bros. 2 (Nintendo 3DS, 2012) are available on the Internet Archive
Released in 2012 for the Nintendo 3DS , this 2.5D side-scrolling platformer is the third entry in the New Super Mario Bros. sub-series.
It seems you're looking for information on where to play or download New Super Mario Bros. 2. The Internet Archive is a digital library that provides access to a wide range of content, including free movies, music, software, and games. However, availability of specific games like New Super Mario Bros. 2 can vary due to copyright and licensing restrictions.