Drag and drop the Splatoon 3 base game and the v2.1.0 update NSP into this folder.

You can use several homebrew tools to install these files directly on your Switch. Using DBI (Recommended for PC Transfer)

A Nintendo Switch running Custom Firmware (CFW) like .

: Typically representative of a physical cartridge dump.

In Goldleaf, choose -> SD Card and locate your files.

Open the tool and add your Splatoon 3 base file and the v2.1.0 update. Choose the option to or Repackage as XCI .

If you prefer to have one consolidated file (game + update), you can use PC tools like or Swiss Army Knife (SAC) .