# Raku Sudoku – logic puzzle — Classic ad-free number games

> Premium classic Sudoku game with multiple difficulty levels and no ads. (iPhone/iPad app by Paulin Design AB.)

- Source: https://appshunter.io/ios/app/raku-sudoku-logic-puzzle/id6745960606 (this page in markdown: same URL + `.md`)
- Developer: [Paulin Design AB](https://appshunter.io/developer/1812668854)
- Category: Games, Entertainment, Board, Puzzle
- Price: Free with in-app purchases (on sale, was $4.99)
- Rating: 5.00/5 from 2 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 16 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, European Spanish
- Released: 2025-05-21
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/raku-sudoku-logic-puzzle/id6745960606/reviews.md

## What is Raku Sudoku?

A premium classic Sudoku experience – no ads, no subscriptions.

Raku Sudoku is designed for players who value clarity, focus, and thoughtful gameplay. Six difficulty levels from Easy to Ludicrous, including legendary 17-clue puzzles curated by mathematician Gordon Royle – the purest and most challenging grids in classic Sudoku.

Pay once. Play forever. No distractions.

Features
· Clean, distraction-free design
· Six difficulty levels — Easy to Ludicrous
· Legendary 17-clue puzzles by Gordon Royle
· Notes, error checking, and hints
· Progress tracking and highscores
· Game Center leaderboards

## Key features

- Distraction-free design
- Six difficulty levels
- Legendary 17-clue puzzles
- Notes, error checking, hints
- Progress tracking and highscores
- Game Center leaderboards

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Unlock | $3.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/raku-sudoku-logic-puzzle/id6745960606/reviews.md

### 3/5 — 数字の大きさ設定

*2026-06-13*

数字の大きさの設定が、最初しかできない。途中で変更できない。

**Developer response:** レビューいただきありがとうございます。

現在の仕様では、iOSのテキストサイズ設定を変更しても、盤面の数字には反映されない仕組みとなっております。ご不便をおかけし申し訳ございません。

今後のアップデートで、盤面のレイアウトが崩れない最大サイズを上限として、プレイ中でも数字の大きさが動的に調整されるよう改善いたします。貴重なご意見をありがとうございました。

### 3/5 — UIは良い

*2026-05-03*

超絶に期待してダウンロード
うーん、簡単w
もう一色メモを追加して欲しいのと初期埋めのオートがあれば良いのに

**Developer response:** レビューとダウンロードありがとうございます！Raku Sudokuを成長させてくれるのは、まさにこういったご意見です。

いくつかご返信させてください：

もっと難しい問題をご希望でしたら、ぜひ「エキスパート」「激ムズ」「超絶」もお試しください。かなり手応えがあります！
もう一色のメモ機能、とても良いアイデアです。今後の機能候補リストに加えさせていただきます。
候補数字の自動入力（初期埋め）も素晴らしいご提案です。今後のアップデートで検討します。
Raku Sudokuを今の形に育ててくれているのは、まさにプレイヤーの皆さまです。本当にありがとうございます！

### 5/5 — Super

*2026-04-07*

Genau was ich gesucht habe, die App ist ohne viel Schnickschnack, man kann direkt starten und auch zwischendurch pausieren und zum anderen Zeitpunkt weitermachen. Bin sehr zufrieden.

**Developer response:** Hallo Cizzle97, vielen Dank für die tolle 5-Sterne-Bewertung! Es freut uns sehr zu hören, dass dir das schlichte Design von Raku Sudoku gefällt und die Pausenfunktion für dich nützlich ist. Viel Spaß weiterhin beim Rätseln!

## Frequently asked questions about Raku Sudoku

### What makes Raku Sudoku different from other Sudoku apps?

Raku Sudoku offers a premium, distraction-free experience with no ads or subscriptions. It features six difficulty levels, including exclusive 17-clue puzzles curated by mathematician Gordon Royle, providing a unique challenge for players.

### How many difficulty levels are available in Raku Sudoku?

Raku Sudoku offers six distinct difficulty levels, ranging from 'Easy' to 'Ludicrous'. This allows players of all skill levels to find a suitable challenge, from beginner to expert.

### Does Raku Sudoku have ads?

No, Raku Sudoku is designed to be completely ad-free. The app emphasizes a clean, distraction-free gameplay experience, allowing users to focus solely on solving the puzzles.

### Is Raku Sudoku a subscription-based app?

No, Raku Sudoku operates on a one-time purchase model. You pay once to unlock the full game and can play it forever without any recurring subscription fees or additional in-app purchases.

### What are the legendary 17-clue puzzles in Raku Sudoku?

The legendary 17-clue puzzles are the purest and most challenging grids in classic Sudoku, curated by mathematician Gordon Royle. These puzzles are known for their extreme difficulty and are a key feature for advanced players.

### Can I track my progress and scores in Raku Sudoku?

Yes, Raku Sudoku includes progress tracking features and high scores. You can also compete with other players through Game Center leaderboards, adding a competitive element to your gameplay.

### What devices is Raku Sudoku available on?

Raku Sudoku is currently available for iPhone. The app is designed to provide an optimal experience on Apple's mobile devices.

### How often is Raku Sudoku updated?

The latest version of Raku Sudoku is 4.2.5, and it was last updated on May 4, 2026. Updates typically focus on improving performance, adding new features, or refining existing ones based on user feedback.

## Version history (last 5 releases)

### 4.5.0 — 2026-08-18

Raku Sudoku is now a native iPad app.

The board was rebuilt for the larger canvas — it keeps a fixed proportion and stays centred instead of stretching, the keypad sits beside the grid in landscape so your hand never covers the puzzle, and the layout adapts continuously to any window size rather than jumping between a few fixed states.

Everything else is unchanged. Still 16 MB. Still no ads, no subscriptions, no pay-to-win. One purchase unlocks all six difficulty levels, forever.

### 4.4.0 — 2026-07-15

New: haptic feedback for a more tactile playing experience.
Raku Sudoku is now free to download. Play one Easy puzzle per day, or unlock all difficulty levels with a one-time purchase. Already purchased the app? Everything stays unlocked – no action needed.

### 4.3.0 — 2026-07-10

Unsere Spieler in Japan wollten größere Zahlen – jetzt ist es soweit! Wählt jederzeit im Menü die Zahlengröße (Klein, Normal, Groß), auch mitten im Spiel, und aktiviert fette Zahlen für mehr Klarheit. Auch die Notizen sind jetzt besser lesbar. Viel Spaß beim Rätseln!

### 4.2.5 — 2026-05-04

Thanks to player feedback, we've added a new "Auto-fill notes" setting — start each puzzle with candidate notes pre-filled. Have ideas for what to improve next? Send them our way.

### 4.2.4 — 2026-04-29

Fehlerbehebungen und Stabilitätsverbesserungen.

## Apps similar to Raku Sudoku

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [3Q Sudoku](https://appshunter.io/ios/app/3q-sudoku/id6503253256) | — | Free | Games |
| [Sudoku Puzzle game Number&math](https://appshunter.io/ios/app/sudoku-puzzle-game-number-and-math/id1545918635) | 4.6 (23) | Free | Games |
| [Sudoku Classic: Brain Puzzle](https://appshunter.io/ios/app/sudoku-classic-brain-puzzle/id1670365985) | — | Free | Games |
| [World Number Place!](https://appshunter.io/ios/app/world-number-place/id6453991105) | — | Free | Games |
| [NumberPlaceLevel 100](https://appshunter.io/ios/app/numberplacelevel-100/id6747824487) | — | Free | Games |
| [Sudoku - Number Logic Puzzle](https://appshunter.io/ios/app/sudoku-number-logic-puzzle/id6449709464) | 5.0 (1) | Free | Games |

## More apps by Paulin Design AB

- [Vägmärken – ta körkort](https://appshunter.io/ios/app/vagmarken-ta-korkort/id6745517104)
- [Klicka Editor](https://appshunter.io/ios/app/klicka-editor/id6748151161)

All apps by Paulin Design AB: https://appshunter.io/developer/1812668854

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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 2026-08-27.*