# Kakuro: Number Crossword — Cross sum challenges

> Logic puzzle where numbers fill grid blocks to match sum clues. (iPhone/iPad app by Conceptis Ltd..)

- Source: https://appshunter.io/ios/app/kakuro-number-crossword/id1197071375 (this page in markdown: same URL + `.md`)
- Developer: [Conceptis Ltd.](https://appshunter.io/developer/479420055)
- Category: Games, Entertainment, Board, Puzzle
- Price: Free with in-app purchases
- Rating: 4.80/5 from 1,883 App Store ratings · 246 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 11 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China)
- Released: 2017-05-25
- Data updated: 2026-08-26
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/kakuro-number-crossword/id1197071375/reviews.md

## What is Kakuro?

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, Kakuro contains no ads and includes a Weekly Bonus section providing an extra free puzzle each week.

PUZZLE FEATURES

• 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

GAMING FEATURES

• No ads
• Unlimited check puzzle
• Unlimited hints
• 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

ABOUT

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.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://www.conceptispuzzles.com/index.aspx?uri=info/doc/220

## Key features

- Fill empty squares to match sum clues
- No number repetition within blocks
- 200 free puzzles and weekly bonus
- Multiple difficulty levels
- Zoom and pencilmark features
- Graphic puzzle progress previews
- Dark Mode support

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Easy Variety 1 | $1.99 | one-time |
| Medium Variety 1 | $1.99 | one-time |
| Medium Variety - Large 1 | $2.99 | one-time |
| Hard Variety 1 | $1.99 | one-time |
| Hard Variety - Large 1 | $2.99 | one-time |
| Medium Snacks 1 | $0.99 | one-time |
| Hard Snacks 1 | $0.99 | one-time |
| Big & Medium 1 | $1.99 | one-time |
| Big & Tough 1 | $1.99 | one-time |
| Big Challenges 1 | $1.99 | one-time |
| Hard Variety 2 | $1.99 | one-time |
| Huge & Tough 10 | $3.99 | one-time |
| Huge & Tough 1 | $3.99 | one-time |
| Huge Challenges 1 | $3.99 | one-time |


## What do users think of Kakuro?

Overall sentiment: positive

**Pros**

- 👍 Easy to use
- 🚀 Smooth gameplay
- 🔒 No ads
- 💡 Variety of difficulty levels
- 👍 Helpful features (pencil marks, check progress)

**Cons**

- 🐛 Some puzzles have multiple valid solutions
- 💡 Wish for more advanced solving techniques
- 💡 Ability to highlight/add pencil marks to multiple cells at once
- 💡 Option to auto-fill pencil marks after using hints

**Commonly reported bugs**

- Some puzzles claim incorrect solutions are correct
- Weekly bonus puzzles not refreshing properly on iOS 17

**Most requested features**

- Ability to highlight and add pencil marks to multiple cells in one operation
- Help feature to learn advanced solving techniques
- Option to auto-fill pencil marks after using hints without overwriting existing marks

## Recent user reviews (10 of 246)

All indexed reviews: https://appshunter.io/ios/app/kakuro-number-crossword/id1197071375/reviews.md

### 3/5 — 繰り返し楽しんでます

*2026-07-24*

とても楽しんでますが、久々にやったらBIGのげーむについて、1番下の列が途中までしか表示されず、スクロールもできず、残念な状態です。

**Developer response:** ご不便をおかけし申し訳ございません。手元のデバイスで確認してみましたが表示の不具合が見つかりませんでした。もしできましたら、問い合わせメールに画像をいただけましたらお調べさせていただきたいと思います。

度々すみません。アプリのバージョンが最新(ver.3.7)になっているかも併せご確認いただけましたら助かります。

### 4/5 — Eliminate “brute force” hint games

*2026-06-22, version 3.5*

I very much enjoy the “very hard” Kakuro puzzles.  Learn a lot about the logical ways to remove candidates.  However, I am greatly disappointed when I get a “brute force” ( = guess ) hint with 20 squares yet to go.  Either a guess is truly required or the logical hint is too difficult to explain in the app.  Either way, I really don’t care to pay for these games that end like this.  The claim is that properly structured games should not require guessing.  Is there a way to save the game state so one can return to the point of the first brute force guess….after wandering in the forest of guesses?

### 4/5 — Brain Gain

*2026-05-24, version 3.5*

Keeps me working that brain and thinking.

### 5/5 — Fun and challenging

*2026-05-01, version 3.5*

The games are a great way to stimulate your mind. If you enjoy a challenge, this a great game for you!

### 5/5 — Good fun!

*2026-04-29, version 3.5*

App keeps the game interesting, challenging, and there’s some nice helping tools.

### 3/5 — Does not save anymore

*2026-04-11, version 3.5*

Since the last upgrade, the app no longer saves my weekly puzzle in progress. This is the same on all Conceptis apps. 
These are my favorite puzzle apps, but I can no longer play the more challenging ones due to having to start over every time I open it.

### 5/5 — Challenging & Gun

*2026-04-04, version 3.5*

Great game to stay sharp with math skills

### 5/5 — Great Kakuro

*2026-02-27, version 3.5*

I thoroughly enjoy this version. I play the hardest and can usually finish in 60 minutes.

### 5/5 — Favorite  “game” app

*2026-01-29, version 3.4*

👍🏻👍🏻👍🏻👍🏻👍🏻

### 4/5 — Two issues, but still best Cross Sums app I found

*2026-01-21, version 3.4*

The game lets you rule out options, like saying I know “134” doesn’t work, but “125” does. Undo doesn’t track such changes, I wish it did.  Also, its error reporting would be better if it tracked when the rules are broken, such as repeating a number, instead of highlighting a sum that disagrees with the solution, because my most common mistakes are due to typing errors, which are easily missed, not logic errors. 

[Response to dev response] I reported the bug with undo about 3 years ago and was told it is too costly to fix. As to highlighting simple errors, I have “Show errors” on, and it absolutely would not be a spoiler to circle the two “1”s I mistakenly entered, and I hate that the option shows me any spoilers.  I have responded with more details to the email provided.

## Frequently asked questions about Kakuro

### What is Kakuro: Number Crossword?

Kakuro: Number Crossword is a logic puzzle game where you fill empty squares in a grid. The goal is to make each horizontal block of numbers sum to the clue on its left and each vertical block sum to the clue on its top. Numbers 1 through 9 are used, and no number can be repeated within the same block.

### What are the key features of this Kakuro app?

The app offers 200 free puzzles, a weekly bonus puzzle, and multiple difficulty levels. It includes helpful features like zoom, pencilmarks for temporary number placement, and the ability to show possible sum combinations or sum remainders. It also supports Dark Mode and provides graphic previews of puzzle progress.

### Is this app free to play?

The app is free to download and play, offering 200 free Kakuro puzzle samples and an extra free puzzle each week. It also includes in-app purchases, suggesting that additional puzzle packs or features might be available for purchase.

### What devices is Kakuro: Number Crossword compatible with?

The app is designed for mobile devices. While not explicitly stated for all platforms, it mentions portrait and landscape screen support for iPad, indicating compatibility with iOS devices. It is also likely available on Android devices given the nature of such puzzle apps.

### How does this app help improve logic skills?

By requiring players to use pure logic and simple arithmetic to deduce the correct numbers for each square, the game actively sharpens logic and improves cognitive skills. The process of solving unique puzzles with no repeated numbers within blocks encourages strategic thinking and problem-solving.

## Version history (last 5 releases)

### 3.7 — 2026-07-28

This version improves performance and stability.

### 3.6 — 2026-07-06

This version improves performance and stability.

### 3.5 — 2026-02-13

This version improves performance and stability.

### 3.4 — 2025-10-08

This version improves performance and stability.

### 3.3 — 2025-06-27

This version improves performance and stability.

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| [Sudoku.com - Number Games](https://appshunter.io/ios/app/sudokucom-number-games/id1193508329) | 4.8 (1,847,599) | Free | Games |

## More apps by Conceptis Ltd.

- [Fill-a-Pix: Minesweeper Puzzle](https://appshunter.io/ios/app/fill-a-pix-minesweeper-puzzle/id479420052)
- [Pic-a-Pix: Nonogram Color](https://appshunter.io/ios/app/pic-a-pix-nonogram-color/id503132420)
- [Link-a-Pix: Nonogram Links](https://appshunter.io/ios/app/link-a-pix-nonogram-links/id517602670)
- [Sudoku: Classic & Variations](https://appshunter.io/ios/app/sudoku-classic-and-variations/id537201666)
- [Hashi: Bridges](https://appshunter.io/ios/app/hashi-bridges/id567583852)
- [Nurikabe: Islands & Walls](https://appshunter.io/ios/app/nurikabe-islands-and-walls/id581912445)

All apps by Conceptis Ltd.: https://appshunter.io/developer/479420055

## Related topics

[kakuro](https://appshunter.io/ios/topics/kakuro) · [real kakuro](https://appshunter.io/ios/topics/real-kakuro) · [kakuro rally](https://appshunter.io/ios/topics/kakuro-rally) · [number crossword](https://appshunter.io/ios/topics/number-crossword) · [kakuro puzzles](https://appshunter.io/ios/topics/kakuro-puzzles)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*