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Getting Started

To start modifying, you need a modded Switch and a legitimate copy of Splatoon 2. Full guide to modding your Switch can be found here. Do note that following a video guide is not advised, as there is no guarantee on how up-to-date the process described therein is. Also note that, as of now, the Switch 2 is considered unmodifiable.

Ensure you never connect to Nintendo's servers when running Custom Firmware. Guides to ensuring this can be found here

This guide will start with the assumption that Atmosphere and Hekate has been set up. The Hekate bootloader has a very useful feature in Tools→USB Tools→SD Card which allows you to edit the contents of the SD card while it is still inserted into the Switch by connecting your Switch via USB-C to USB-A (i.e., the Switch Pro cable).

You may be prompted to format a drive when editing your SD card. NEVER DO THIS!

Extraction

One tool you can use to extract the game's data is nxdumptool You can follow the in-app instructions to dump from gamecard or from internal storage