You won’t be looking for a paper puzzle ever again!

With 4 difficulty levels, intuitive interface, and all the functions right at your fingertips, this Sudoku app is sure to be your favorite. Interrupted? Exit Sudoku, and the puzzle is saved exactly as you see it!

Want to know how you stack up against other Sudoku players? Upload your results to our servers and see for yourself, or take part in a weekly Sudoku competition.

* 4 difficulty levels
* 3 input modes: "Digit first", "Cell first", popup
* Pencil marks (a.k.a. Notes) with auto fill / erase option
* Selected digit and various other highlighting options
* Show digit counts option
* Auto-save
* Unlimited Undo and Redo
* Intelligent hints that use only logic
* Two levels of automatic error checking option
* Submit results and track progress online
* Top scores and History
* Real time competitions

Please contact our support team at if you have any questions, comments, or suggestions about improving this Sudoku app.

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What’s New

Version 10.2.4

- the Settings panel changes are now saved automatically; the "Save" (checkmark) button is no longer present
- the gray background that appeared on some devices should be fixed now
- the Undo button is now next to the Menu for easy one-touch access
- the "Unable to connect" issue when uploading results should be fixed now
- the font size has been increased to improve puzzle readability
- additional visual improvements and optimization
- bug fixes

Ratings and Reviews

4.8 out of 5
3.7K Ratings

3.7K Ratings

JynxBJJ ,

Great app

I’m visually impaired and Red/green colour-blind. This is the first sudoku app I’ve been able to use easily. I read the review that suggested having each number be a different color. Obviously, for those of us with color blindness this wouldn’t be very helpful, I could make the app on usable. Perhaps a setting where The user could choose to use the colorful set up as the default and allow those of us with impaired color vision to keep it at the black and white. I would find it helpful if as the person who suggested the colorful numbers did that the number I have chosen in either the grid it’s self or the number pad at the bottom could be bolded. That way I could easily scan for the numbers that I need. However, the way you have it now works exactly like it does in the paper so it’s not a necessity. I do like how you haveThe scoring set up. Being able to distinguish between my on edited and aided scores lets me really enjoy trying to beat myself. Thanks again for such a great app! PS: please excuse any typos as iPad doesn’t let me see my review in large enough print for me to proofread it.

StephenJSpace ,

Colour coded numbers and auto signals

This is my personal favourite version of sudoku. One thing the bothers me about this game is the amount of time to ‘set up’ if you will and the auto fill option really helps me maintain my sanity.

That being said I think that colour coded numbers would be nice. Right now when you select a number that has already been filed in all other potential possibilities that have been notated are blue, this is nice but how about colorising those notated numbers - say all 1’s are blue, the 2’s are... green, the 4’s... red, etc.

Further it would be nice to have an extra button - auto signals - or AS where when clicked will automatically fill in all cells with the corresponding number where only one possible number is notated for said cell.

Right now, using the current automation features currently available I can solve an extreme puzzle in about 3 minutes, if I really hustle but I find myself spending more than half of that time selecting cells and typing numbers and over half of those cells end up with only one possibility witch kinda makes me feel that I’m wasting a lot of time moving my fingers around the screen superfluously. If I could eliminate this I think I could solve it in under a minute.

This is otherwise a great app.

C.Ichiban ,

More than one way to solve a board

After my previous favorite Tap Sudoku stopped getting updates, I tried a half dozen apps before finally finding this one, where I could enter the number first then the cell. This speeds up your ability to play and is really a must, but most apps don’t offer it. After one game, I was pleasantly surprised at how the game also keeps your top 10 times. Neat! However, after playing 5-6 times (on “extreme” naturally bc I’m an addict), I came to a point when I realized there were no certain moves left. Thinking I may have missed a hint, and being nervous about the ticking clock, I guessed and it worked. But this continued to happen and I realized these are not true sudoku boards. A TRUE SUDOKU BOARD HAS ONLY ONE WAY TO SOLVE THE PUZZLE. The boards in this app offer several. This is problematic bc you are required to make 50/50 guesses (which often both work) in order to complete the puzzle. There’s no logic as to which 50/50 cells have one or two possibilities. Therefore, there is a new component of luck introduced, and that’s just not sudoku. I love the other features and gameplay functions but I’m not sure I can support this unfortunate flaw in the game itself.

Developer Response ,

Hello. Thank you for writing.

Is it possible that when you come to a point where there are "no certain moves left", it is simply because _you_ don't see the next logical move?

The fact that your guess turned out to be correct does not mean that there are several possible solutions. It just means you guessed correctly.

Regarding your claim that when making a 50/50 guess both often work, this is simply not true. Our puzzles have one and only one solution. If you'd actually taken one guess and followed it to a solution, then the other one would not result in a solution and vise versa.

Again, when you say "there's no logic as to which 50/50 cells have one or two possibilities", is it possible that you simply don't see the logic?

Allow me to reiterate: every puzzle has one and only one solution. There is no guessing
required and the puzzles are solvable with logic alone.

If you come across a puzzle where you are unable to deduce the next logical move, you may find it useful to post it to our forums and someone from the community might be able to help to guide you to the next move ( Or, if all else fails, you may send us a screenshot and we will have a look (


Icenta, Inc.
30.7 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Dutch, German, Hebrew, Hindi, Hungarian, Japanese, Russian, Simplified Chinese, Swedish

Age Rating
Rated 4+
© 2009-2017


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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