Sudoku: Classic and Variations 4+

No ads. More fun‪.‬

Conceptis Ltd.

    • 4.9 • 516 Ratings
    • Free
    • Offers In-App Purchases



Play six different Sudoku variations in a single app! Start with classic Sudoku grids and advance to Diagonal Sudoku, Irregular Sudoku and OddEven Sudoku - each with a different look and a unique twist of brain challenging logic. Huge brain-bashing Mega Sudoku puzzles, also known as Monster Sudoku, are offered for iPad only.

With its diverse variations and straightforward no-frills game design, Conceptis Sudoku brings a new dimension to Sudoku mobile gaming - on both iPad and iPhone.

To help see the puzzle progress, graphic previews in the puzzle list show the progress of all puzzles in a volume as they are being solved. A Gallery view option provides these previews in a larger format.

For more fun, Conceptis Sudoku contains no ads and includes a Weekly Bonus section providing an extra free puzzle each week.


• 120 free Classic Sudoku and Sudoku variants puzzle samples
• Variants include Mini, Diagonal, Irregular, OddEven and Mega
• Extra bonus puzzle published free each week
• Multiple difficulty levels from very easy to extremely hard
• Puzzle library continuously updates with new content
• Manually selected, top quality puzzles
• Unique solution for each puzzle
• Hours of intellectual challenge and fun
• Sharpens logic and improves cognitive skills


• No ads
• Unlimited check puzzle
• Unlimited hints
• Show conflicts during gameplay
• Unlimited Undo and Redo
• Pencilmarks feature for solving hard puzzles
• Autofill pencilmarks mode
• Highlight Excluded Squares option
• Lock number on keypad option
• Concurrently playing and saving multiple puzzles
• Puzzle filtering, sorting and archiving options
• Dark Mode support
• Graphic previews showing puzzles progress as they are being solved
• Portrait and landscape screen support (iPad only)
• Track puzzle solving times
• Backup & restore puzzle progress to iCloud


Conceptis Sudoku variations have also become popular under other names such as Sudoku by Dave Green, Sudoku 12x12, Sudoku 16x16, Jigsaw Sudoku, Nonomino Sudoku, Squiggly Sudoku, Sudoku X and many more. All puzzles in this app are produced by Conceptis Ltd. - the leading supplier of logic puzzles to printed and electronic gaming media all over the world. On average, more than 20 million Conceptis puzzles are solved each day in newspapers, magazines, books and online as well as on smartphones and tablets across the world.

What’s New

Version 5.4

This version adds Dark Mode options in the app's settings.

Ratings and Reviews

4.9 out of 5
516 Ratings

516 Ratings

StreepPeeps ,

Excellent! No Ads! :-)

Free version has 120 puzzles - 40 for each level. There are also daily bonus puzzles. The irregular level is awesome & really works your brain. Unlike some, this app lets you check your progress for errors and doesn’t penalize for undo’s or restarts, etc. You can clear games and replay to better your time. Haven’t been bugged to purchase anything. Just good old fun!

MattDMo ,

Great time-waster, but guessing sometimes needed

This is generally one of the first apps I turn to when I have a few minutes to kill, or when I need to chill out before falling asleep. My only complaint is that on some of the Very Hard levels (at least in the Diagonal puzzles), you have to guess sometimes when there are no logical moves to make and you're stuck. You then either need to use the Assistant to verify your guess, or keep playing until you reach a logical inconsistency and have to go all the way back and guess something else. It kind of ruins the whole logical vibe of the game.

Developer Response ,

Thank you for your feedback, but please note that you never need guessing to make a next move. There is always a step you can make using logic deduction. In case you are stuck, you can use the Hint feature which shows you the next move. Or, you can send us a screenshot to and we will explain how you can make the next move without guessing.

cdawn1022 ,

Dark mode

I have been playing this and other Conceptis apps for years and I love them, but please make dark mode an OPTION instead of automatically adjusting based on phone settings. I have my phone on dark mode but that doesn't mean I want to play my sudoku with white numbers on a black background. It really strains my eyes and I don't want to have to go into my phone settings to change to light mode every time I use the app. I'm sure some people like the dark mode but if you give us a choice then everybody wins. Sorry if there is already an option to turn it off but I'm not seeing it.

Developer Response ,

Thank you for your feedback. We received quite a lot of complaints like yours, so we are very soon going to release an update in which you can set dark mode inside the app. Please stay tuned.

App Privacy

The developer, Conceptis Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Identifiers
  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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