KenKen® - Brain Training Puzzle

Train your brain with KenKen®, the unbelievably fun, exciting and addictive logic and math puzzle! KenKen is an amazing puzzle that is frequently described as “sudoku on steroids.” If you like other brain games such as sudoku, 2048, Threes, Kakuro, Unblock Me, Tricky Test, Tetris, Flow, jigsaw puzzles, word search puzzles, or crossword puzzles, then you will LOVE KenKen!

This is the ONE-AND-ONLY Original KenKen app, created by acclaimed Japanese mathematics educator Tetsuya Miyamoto. Don’t be fooled by unauthorized versions such as mathdoku and calcudoku, and don't get stuck in a sudoku rut. Play KenKen math puzzles today!

KenKen appears daily in the New York Times and hundreds of other publications around the globe. NY Times puzzle editor, Will Shortz, calls KenKen "the most addictive puzzle since sudoku."

There are virtually unlimited KenKen puzzles available to you on this app. The first 50 are included FREE with the download. If you need problem! Just order them and they'll appear immediately. YOU select the size, difficulty level, and operations.

KenKen Classic includes:
- 50 FREE fun math puzzles of every size and difficulty level
- Unlimited FREE 3x3 size puzzles to learn from and enjoy
- Virtually unlimited puzzles, ranging from 3x3 to 9x9 grids, from Easy to Expert
- A variety of color schemes and music (you can even set your own music to play in the background)
- 3 input modes for digits and notes
- Great extra features such as Hints, Check, Undo, Redo, Reset, Pause, and Timer
- Online leaderboards
- Ability to post results directly to Twitter
- Ability to email results and invite friends

What's New

Version 2.5

Behind the scenes improvements to make puzzle play better and faster, and puzzle delivery better.

Ratings and Reviews

4.5 out of 5

475 Ratings

475 Ratings

Many games can't be solved without guessing.


The games are machine generated, and many (at the expert level, at least) require guessing to solve. Kenken is a LOGIC game, not a guessing game. The UI is also frustratingly bad, requiring multiple taps to do simple things like change note color, and it's easy to change notes inadvertantly.

The developer's response is simply not true. I've played several games, for example, where the last 10 moves or so could be played out two ways, both of which yielded a correct result, but only one of which was deemed as a win. Several games were simply not solvable without playing out a guess until it failed, then backing out to the decision and choosing the other alternative. That's not "considering," it's guessing. No machine-generated game should be posted if it hasn't been solved by a human player who can't project 20 moves out. Also, the UI becomes more and more frustrating over time.

At present, this is the only alternative on the app store, given that the older (and excellent) "Will Short" app doesn't run under the most recent iOS version, but it's not a great alternative. I'll move to a competitor in a heartbeat if an alternative appears in the store.

Developer Response

Thank you for playing KenKen. Our KenKen puzzles are all composed by a computer program called the Kenerator, which has been developed using advanced artificial intelligence techniques. The Kenerator checks every puzzle to ensure that the totals in all the cages are correct, and that no row or column has the same number
more than once. The Kenerator also verifies that there is only one solution to each puzzle. Sometimes solvers contact us, believing they have found a flaw in a puzzle, but up to now no puzzle generated by the Kenerator has ever been found to have an error. We would, of course, want to know if an error did exist in any of our puzzles, and so we do not wish to discourage solvers from contacting us. If you ever find a game that's "not solvable" or you think has an alternative solution, please take a screen shot and send it to us at and we can respond with the solving technique and/or correct solution.

I give up


I enjoy playing KenKen and have for several years. The puzzles in this app are great and the playing functions of the game are great. 5 stars on that.
But the overhead of the app is horrendous. I have had to reload the game a dozen times in the past six months. Sometimes the settings will work and sometimes they won't. I pay for the unlimited games but wish they would let me reset or something. Currently, e settings will not allow me to "Hide played games". So it loads all of the games I have played in the past. Too much overhead! Support has been a joke. They just respond with "reload game".
It's too bad. The game itself is fine.

Developer Response

We apologize for any problem. We can reset your puzzles if you prefer. Please write us at to help resolve your issues.

Excellent game!


Love this app, allows me to keep my brain in check with fun and interesting puzzles. For people unfamiliar with kenken, it is essentially sudoku with the added twist that there are “cages” (oddly shaped boxes) whose result value must be met through a basic mathematical operation.

Only flaw, if any, in the app is that I’m wondering if some of the records on the leaderboards have been made with bots/cheats. Some of the puzzles have been solved in extremely, almost inhumanly fast times.

Developer Response

Thank you! The time issue for the leaderboard is something we're aware of but it's controlled by Apple GameCenter.

Please consider to join our community where we offer unusual and unique KenKen® and other intelligent fun diversions on a regular basis.


KenKen Puzzle, LLC
40.2 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© KenKen Puzzle LLC
In-App Purchases
  1. 250 Puzzles PLUS removal of all ads! $7.99
  2. 31 Puzzles PLUS removal of all ads! $1.99
  3. 1000 Puzzles PLUS removal of all ads! $14.99


  • Family Sharing

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

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