(Nintendo Submission Package) involves significant legal and security risks. While third-party sites like the one mentioned in the SwitchPirates community

There are, however, official legal ways to try the game:

The right Joy-Con tracks your hand gestures. You can play Rock-Paper-Scissors or solve math problems by holding up the correct number of fingers.

While legitimate digital purchases are installed as NSPs in the background of your system, loose NSP files found on the internet are typically used in conjunction with custom firmware (CFW) or console modifications. The Reality Behind "Free NSP" Downloads

Originally popularized on the Nintendo DS, the Brain Training series uses short daily exercises to calculate your "Brain Age." The ideal score is 20 years old. The Nintendo Switch version utilizes the console's unique hardware to introduce brand-new puzzles alongside classic mini-games. Key Features of the Switch Version

On the Nintendo Switch, Dr. Kawashima's Brain Training offers a variety of brain-training exercises, including: