Sudoku ∙ Classic Sudoku Games 12+

This is a fantastic Sudoku app. It highlights things for you, automatically deletes notes as you add numbers that rule them out, and has a cool setting that you can use to go faster if you like to solve the board by number instead of by block, row, or column. It has 3 different themes: white, brown, and black. You can set it to automatically match your phone’s light/dark settings.
I do have two little nits to pick with it:
1. The hint button always fills in notes and changes them to the most correct notes for you. Writing notes and whittling down possibilities is a big part of sudoku and there’s no way to quickly undo the hint notes.
2. It’s kinda easy to accidentally hit the wrong button and it will always count against you if you do.

This sudoku easily and readily makes concepts appear in the player’s mind….concepts for deciding “the next solution concept” to apply.
There are unheard-of tricks that VERY FEW Sudoku Players know about, which not only work precisely well, but which also enrich the human mind (THINKING). I have been using Sudoku for that purpose, to discover more of these tricks.
The tricks I refer to emerge from a deep understanding of orthogonal arrays, which many game designers are little aware of. I chiefly use Sudoku as a “research laboratory”. It is the best Sudoku game on the Internet….for all of the above reasons.
One discovery is about the word “mistakes” — which is tracked by this company’s software. But what is a “mistake”? There are at least two kinds: one involves hitting a number to fill a blank square too quickly and carelessly. But the other so-called “mistake” is a “calculated risk”, which for me is often correct!
My fairly brief career with “orthogonal arrays” has taught me many lessons, which I may or may not reveal later.
This is the best Sudoku game available — if you really want to learn it well. It is, besides having other good features, a LEARNER’S game.

This is by far my favorite sudoku ios app. They have incorporated so many setting options to customize game play. In particular the setting to lock input to one number so I can just tap on all the cells with that number, instead of having to select a cell first and then pick what number to input. I was shocked by how hard it is to find an app with this setting.

My single only issue is that I can’t figure out how to pay to remove ads. But I won’t remove a star for what is most likely user error. But devs please make it easier to remove ads, I would love to give you my money!