This is the easiest method. When you buy the game digitally, your Switch downloads the NSP directly. You cannot access the raw file without a hacked console, but it exists on your system.
(If you want, I can convert this into a shorter review, a strategy guide for specific worlds, or a staged practice plan for tight platforming sections.) new super mario bros u deluxe switch nsp
The game also includes a reworked World Map, which now features more paths and secret areas, providing players with a greater sense of exploration and discovery. Additionally, the Deluxe edition includes all the original DLC from the Wii U version, plus new content, such as additional levels and gameplay modes. This is the easiest method
While largely a port, the Deluxe edition introduces several enhancements and additions: (If you want, I can convert this into