Mario Kart 8 Deluxe Switch Nsp [portable] -

It is identical to games downloaded directly from the official Nintendo eShop.

However, if you’re looking for related to Mario Kart 8 Deluxe on the Nintendo Switch, here are some useful options:

Here is a technical overview of those subjects:

Place your physical Mario Kart 8 Deluxe game card into the console.

Open the open-source homebrew application NXDumpTool.