Nintendo is incredibly efficient at detecting modified consoles or pirated software. If you install an NSP file and connect to the internet, your Switch could be permanently banned from the eShop and online play.
If you're interested in exploring other brain-training games on the Nintendo Switch, here are some popular alternatives: dr kawashimas brain training switch nsp free top
refers to Nintendo Switch game packages often shared illegally. "Free" in this context typically signifies piracy, which violates copyright laws, harms developers, and can expose users to malware. Downloading pirated Switch games is not a safe or legal way to access Dr. Kawashima’s Brain Training for Nintendo Switch (released in the West as Dr. Kawashima’s Brain Training for Nintendo Switch or Brain Age Training in some regions). which violates copyright laws