If you are looking for mental stimulation without the price tag of a Switch title, consider these options:

Sudoku.com or Archive.org (for older mental gymnastic titles) provide the same logic puzzles for free.

The Switch version heavily relies on the Stylus (included with the physical version) and the Joy-Con IR camera . Playing a pirated version on a Switch Lite, for example, makes many exercises impossible without buying extra Joy-Cons. Is Dr. Kawashima "Better" Than Free Alternatives?