If you are looking at this for technical or homebrew reasons, common requirements for running these files include:

While this specific string is often associated with ROM distribution sites and homebrew communities, it is important to note that the official game software is actually on the Nintendo eShop . Game & Update Details

: A physical RC kart (Mario or Luigi) is required to actually play the game, as the software uses the kart's built-in camera to create the augmented reality track in your home. Mario Kart Live: Home Circuit NSP/ XCI ROM v2.0.0 Download

: Version 10.1.0 or higher is generally required for the base game.