NSP files are a format used by the Nintendo Switch for distributing and installing games and other software. They contain all the necessary data for a game, including its code, assets, and metadata, allowing for easy distribution and installation on a Switch console. NSP files can be found through various online sources, but it's essential to be cautious and aware of the potential risks associated with downloading copyrighted content without purchasing it.
As for fully digital, the Nintendo eShop says the game requires 16.6 GB of free space on the system. download super smash bros. ultimate nsp