Ones not requiring a degree in anything like maths, statistics, economics or physics. Games that can be solved by anyone with a sufficient interest in logic, trial and error and a bit of luck.

1. Sudoku (not the killer level).
2. Sumplete.
3. Wordle, plain vanilla and its multiple-simultaneous and varying-length options.
4. Polygonle.
5. Squareword.
6. Quintessential.
7. Mathler.
8. Waffle.
9. Squaredle.
10. Anagram.
11. Cryptogram.
12.

@Kewpie
Foursight was one I enjoyed in the 1970s

@kewpie said
1. Sudoku (not the killer level).
2. Sumplete.
3. Wordle, plain vanilla and its multiple-simultaneous and varying-length options.
4. Polygonle.
5. Squareword.
6. Quintessential.
7. Mathler.
8. Waffle.
9. Squaredle.
10. Anagram.
11. Cryptogram.
12.

I'll play anything that is designed for a single-player game, but Candy Crush is a bit too basic.

I loved the original Angry Birds, got every last one out to 3 stars eventually!

https://www.brainbashers.com/today.asp

www.mental-aktiv.de/trainingscenter/

German langauge, but I think self-explaining

Logic Puzzles

https://www.ahapuzzles.com/logic/logic-puzzles/

Luxor and Puzzle Kingdoms are a couple that
I enjoy