Kakuro: Number Crossword 4+

Cross sum challenges

Conceptis Ltd.

    • 4.8 • 852 Ratings
    • Free
    • Offers In-App Purchases



Fill empty squares so each block sums up to the number on its left or on its top. Each puzzle consists of a blank grid with sum-clues in various places. The object is to fill all empty squares using numbers 1 to 9 so the sum of each horizontal block equals the clue on its left, and the sum of each vertical block equals the clue on its top. In addition, no number may be used in the same block more than once.

Kakuro are addictive logic puzzles best described as number-crosswords. Using pure logic and simple add/subtract calculations, these fascinating puzzles offer endless fun and intellectual entertainment to puzzle fans of all skills and ages.

The game includes zoom for easier solving of large puzzles, as well as helpful features such as showing possible sum combinations in a block, showing the sum remainder of a block, and using pencilmarks to make temporary placement of numbers in the grid.

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 Kakuro includes a Weekly Bonus section providing an extra free puzzle each week.


• 200 free Kakuro puzzle samples
• Extra bonus puzzle published free each week
• Multiple difficulty levels from very easy to extremely hard
• Grid sizes up to 22x22
• Also includes 5-grid Samurai Kakuro
• 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


• Unlimited check puzzle
• Show errors during gameplay
• Unlimited Undo and Redo
• Pencilmarks feature for solving hard puzzles
• Autofill pencilmarks mode
• Show Sum Combinations feature
• Show Sum Remainder feature
• 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
• Enlarge, reduce, move puzzle for easy viewing
• Portrait and landscape screen support (iPad only)
• Track puzzle solving times
• Backup & restore puzzle progress to iCloud


Kakuro have also become popular under other names such as Kakkuro, Cross Sums and Tashizan Cross. Similar to Sudoku, Hashi and Slitherlink, the puzzles are solved using logic alone. 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 2.8

This version Introduces Dark Mode support: Enjoy a more comfortable viewing experience when solving puzzles in low-light environments

Ratings and Reviews

4.8 out of 5
852 Ratings

852 Ratings

hnkahl ,

Best version of a great puzzle game

First, Kakuro is a great puzzle game in its own right, much more fun than Sudoku in my opinion. I like it because it is a number and logic puzzle, whereas Sudoku is strictly a logic puzzle. Second, Conceptis has combined quality puzzles that are accurately graded for difficulty with a flawless user interface and a never ending supply of new puzzles to produce the best Kakuro app available. Conceptis began publishing great Kakuro books in 2006 and with this app has continued with the same quality and grading system digitally. Beware, once you develop some skill, Kakuro is very entertaining and you can easily get hooked and waste an incredible amount of time. Highly recommended. I did suggest a couple of improvements, one of which I have seen in another app. It would be helpful in solving if you could either enter color coded pencil marks, or if you had the option to place pencil marks in the order in which they are entered. So far, they don’t seem inclined to implement either of these suggestions.

Journeyman2015 ,

Fantastic for number logic fans

First the nitpick: There is a learning curve to a point, especially if mental math is not your forte. Learning the “Kakuro block” combinations will help immensely if you’re a new player.

Other than that, if you are a fan of these things, run, do not walk, to this app. Not only are the puzzles appropriately graded for difficulty, but you get a huge array of starter puzzles to help you figure out the difficulty that’s right for you. There is also a new bonus puzzle each week and new content, all reasonably priced, is added regularly. Being able to check your grid as many times as you want to is also very helpful.

The quality of this is a close second to famed Japanese puzzle makers Nikoli for puzzles that are challenging but fair no matter what your skill level. There are many other Conceptis apps, so there is a good chance that you will find the kind of logic puzzle that suits your fancy. Recommended on all counts!

Auntie Flora ,

Cross Sums forever!

I truly enjoy this app. The only improvement I would like to see would be a help feature where I could learn some more advanced solving techniques. This would be a huge undertaking. The skills included in the app are the standard ones, but where there are many options for learning advanced sudoko techniques, I find very limited options for advanced Kakuro techniques. I can solve the hard level with time but sometimes get stuck on the hard plus level. I need new techniques before I try the truly challenging puzzles.

Developer Response ,

Thank you for your feedback and suggestions. We hope in the future we will be able to add an Assistant feature as we did for the Sudoku app. This will then help significantly in learning new techniques.

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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