On a retail, unmodified Nintendo Switch, users purchase and download games directly to their console's internal storage or microSD card via secure, encrypted channels. However, the custom firmware (CFW) community uses these exact same file types for administrative and archival backups. NSP vs. XCI Formats
Many sites promising "direct downloads" for popular Switch games are fronts for adware or credential stealers. They often hide the actual file behind infinite "verification" surveys. The Bricking Risk: new super mario bros u deluxe switch nsp free new
New Super Mario Bros. U Deluxe Switch NSP: What You Need to Know On a retail, unmodified Nintendo Switch, users purchase