Users typically use tools like Tinfoil to install NSP files from an SD card root.
Features traditional plunger launches and dual-flipper action to keep the ball in play. Pinball Big Splash Switch NSP [Update] (eShop)
How to Install NSP Files from SD card to the Nintendo Switch using Tinfoil!!! Users typically use tools like Tinfoil to install
Ensure you have at least 176 MB of free space on your system or microSD card. Pinball Big Splash Switch NSP [Update] (eShop)