# Diagonal Sudoku: Sudoku X Game — Classic Logic Number Puzzle

> Logic puzzle game with Sudoku and a diagonal number placement rule. (iPhone/iPad app by Ikuhei Kure.)

- Source: https://appshunter.io/ios/app/diagonal-sudoku-sudoku-x-game/id6755570496 (this page in markdown: same URL + `.md`)
- Developer: [Ikuhei Kure](https://appshunter.io/developer/1837581334)
- Category: Games, Puzzle
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 13 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Brazilian Portuguese, Russian, Chinese (Simplified, China), European Spanish and 1 more
- Released: 2025-12-05
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/diagonal-sudoku-sudoku-x-game/id6755570496/reviews.md

## What is Diagonal Sudoku?

Ready for a fresh twist on classic Sudoku?

Diagonal Sudoku adds an exciting new rule: both main diagonals must also contain numbers 1-9 without repetition.

This simple change transforms every puzzle into a deeper strategic challenge.

Whether you're a Sudoku veteran seeking new challenges or a beginner looking to sharpen your mind, Diagonal Sudoku offers the perfect brain workout with four difficulty levels and fresh daily puzzles.

【DAILY CHALLENGES & STREAKS】
Start each day with a new puzzle!
Complete daily challenges to build your streak and stay sharp.
Track your progress and compete with yourself to maintain the longest streak.

【FOUR DIFFICULTY LEVELS】
- Easy: 40 starting numbers for relaxed play
- Medium: Balanced challenge for daily players
- Hard: Test your skills with fewer hints
- Expert: Only 22 numbers for ultimate brain training

【ACHIEVEMENTS & RANKING SYSTEM】
Unlock 10 unique achievements as you play.
Progress through 7 ranks from Novice to Grandmaster.
Every completed puzzle earns points based on difficulty, speed, and accuracy.

【SMART FEATURES】
- Pencil notes to track candidates
- Hints when you're stuck
- Error highlighting to learn faster
- Auto-save ensures you never lose progress
- Customize timer display, haptic feedback, and more

【PREMIUM FEATURES】
Upgrade for the ultimate experience:
- Unlimited hints
- No ads
- Exclusive weekly challenges with bonus points
- Access to past 30 daily puzzles
- Detailed performance statistics

【Terms of Use (EULA)】
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Download now and discover why the diagonal twist makes all the difference. Your daily brain training starts here!

## Key features

- Diagonal rule for classic Sudoku
- Daily challenges and streaks
- Four difficulty levels
- Achievements and ranking system
- Pencil notes and hints
- Error highlighting and auto-save

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium (3 Months) | $3.99 | per 3 months |
| Premium (Monthly) | $1.99 | per month |
| Premium (Annual) | $8.99 | per year |



## Frequently asked questions about Diagonal Sudoku

### What is Diagonal Sudoku?

Diagonal Sudoku is a logic puzzle game that builds upon classic Sudoku by adding a rule: both main diagonals must also contain the numbers 1 through 9 without repetition. This creates a more strategic and challenging experience.

### Does Diagonal Sudoku have ads?

Yes, Diagonal Sudoku contains advertisements. Users can remove ads by upgrading to the premium version, which also offers unlimited hints and exclusive weekly challenges.

### What are the difficulty levels in Diagonal Sudoku?

Diagonal Sudoku offers four difficulty levels: Easy (40 starting numbers), Medium (balanced challenge), Hard (fewer hints), and Expert (22 starting numbers) for ultimate brain training.

### Can I play Diagonal Sudoku offline?

The provided information does not specify if Diagonal Sudoku can be played offline. However, features like daily challenges and streaks often require an internet connection.

### How does the ranking system work in Diagonal Sudoku?

Diagonal Sudoku features a ranking system with 7 ranks, from Novice to Grandmaster. Players earn points for completed puzzles based on difficulty, speed, and accuracy, which contribute to their rank progression.

### What are the premium features in Diagonal Sudoku?

The premium version of Diagonal Sudoku offers unlimited hints, no ads, exclusive weekly challenges with bonus points, access to the past 30 daily puzzles, and detailed performance statistics.

### How often is Diagonal Sudoku updated?

Diagonal Sudoku was last updated on February 26, 2026, indicating regular updates. The current version is 1.04.

### What devices is Diagonal Sudoku available on?

Diagonal Sudoku is available on iPhones and iPads, as indicated by its supported devices list.

## Version history (last 4 releases)

### 1.04 — 2026-02-26

Save your game progress and resume anytime — never lose your place again.

### 1.03 — 2026-02-18

Smarter game logic. Fresh icon. Redesigned UI. Everything feels smoother and looks better.

### 1.02 — 2026-01-26

update code to increase performance

### 1.01 — 2025-12-05

No release notes.

## Apps similar to Diagonal Sudoku

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Sudoku Solver - SukutuTutor](https://appshunter.io/ios/app/sudoku-solver-sukutututor/id6755566085) | 5.0 (1) | Free | Games |
| [Crossoku. Sudoku X.](https://appshunter.io/ios/app/crossoku-sudoku-x/id6759494212) | — | Free | Games |
| [Word Cubes 3D](https://appshunter.io/ios/app/word-cubes-3d/id6756241874) | 5.0 (2) | Free | Games |
| [X-sudoku.com](https://appshunter.io/ios/app/x-sudokucom/id6762609666) | — | Free | Games |
| [X-Sudoku](https://appshunter.io/ios/app/x-sudoku/id6755918569) | — | Free | Games |
| [Color Sudoku - Colrx](https://appshunter.io/ios/app/color-sudoku-colrx/id6761809569) | — | Free | Games |

## More apps by Ikuhei Kure

- [lifeTime left](https://appshunter.io/ios/app/lifetime-left/id6751931703)
- [toFutureMe](https://appshunter.io/ios/app/tofutureme/id6753127912)
- [Zip Game: Number Path Puzzle](https://appshunter.io/ios/app/zip-game-number-path-puzzle/id6757413224)
- [Tap Word - Reader's Dictionary](https://appshunter.io/ios/app/tap-word-readers-dictionary/id6757698151)
- [Zen Word!](https://appshunter.io/ios/app/zen-word/id6757796615)

All apps by Ikuhei Kure: https://appshunter.io/developer/1837581334

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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 2026-08-25.*