The most recent general update for Switch and Switch 2 compatibility. Ver. 1.2.0: Brain Training World Championship Working Memory Challenge to the Daily Training menu. Ver. 1.1.0: General fixes and handwriting recognition improvements.
Ensure your are current to allow the update to boot. To help you get the right file, could you tell me: Your current system firmware version? Which region your game is from (USA, EUR, or JPN)? dr kawashimas brain training switch nsp update link