An (Nintendo Submission Package) is the standard format for digital Switch content. While these files are used for legal backups of games you own, downloading pirated content from third-party sites violates copyright laws and carries the risk of a console ban if connected to Nintendo's official servers. For safe and legal digital downloads, always use the Nintendo eShop .
If you enjoy the game, we strongly encourage you to by purchasing the game legitimately on the Nintendo eShop. This ensures they can continue to create beautiful hand-drawn games and provide future updates. curse+of+the+sea+rats+rom+nsp+update+switch