# Classic Sudoku - Star Sudoku — Daily Brain Training

> Logic puzzle game combining Sudoku with a constellation theme for daily brain training. (iPhone/iPad app by ChanGyu Kang.)

- Source: https://appshunter.io/ios/app/classic-sudoku-star-sudoku/id6760512129 (this page in markdown: same URL + `.md`)
- Developer: [ChanGyu Kang](https://appshunter.io/developer/1869205578)
- Category: Games, Entertainment, Board, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 7 MB
- Languages: English, French, German, Japanese, Korean, Chinese, Spanish
- Released: 2026-03-16
- Data updated: 2026-08-24
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/classic-sudoku-star-sudoku/id6760512129/reviews.md

## What is Classic Sudoku?

SudokuAstra, a logic puzzle that completes constellations!

Mysterious constellations in the night sky meet classic Sudoku.
SudokuAstra is a logic puzzle game that adds a calm constellation mood to the familiar fun of filling in Sudoku cells one by one.

Whether you are a beginner who wants to play casually or an experienced player looking for a greater challenge, choose a difficulty that fits your level and refresh your mind every day.

[ Key Features ]

Beautiful Constellation Theme
Immerse yourself in a calm puzzle experience that feels like completing constellations across the night sky as you fill in the numbers.

Smart Logic Hints
When you get stuck, helpful Sudoku hints guide you toward the next clue.

Multiple Difficulty Levels
Enjoy Sudoku at your own pace, from easy puzzles to more challenging boards.

Clean Interface
A simple and intuitive layout helps you focus on solving puzzles without distractions.

Offline Play Support
Basic puzzles can be played anytime, anywhere, even without an internet connection.

Records and Achievements
Check your play history, progress by difficulty, and achievements as you continue your own Sudoku journey.

[ PRO Version Benefits ]

Upgrade to the PRO version for a more comfortable puzzle experience.

With a one-time purchase, you can remove ads and use hints without limits.
Enjoy SudokuAstra more deeply in a distraction-free environment.

Start your calm brain journey under the starlight with SudokuAstra.

## Key features

- Constellation theme
- Logical hints
- Multiple difficulty levels
- Clean interface
- Offline play
- Records and achievements

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Sudoku Astra Pro | $0.99 | one-time |


## Recent user reviews (10 of 12)

All indexed reviews: https://appshunter.io/ios/app/classic-sudoku-star-sudoku/id6760512129/reviews.md

### 5/5 — 스도쿠는 원래도 즐겨했는데

*2026-08-03*

별자리를 같이 알게되는 건 이색적이에요! 인터페이스도 깔끔해서 몰입도 잘되고 좋습니다!

### 5/5 — 심심할 때 정말 좋아요!

*2026-08-01*

지하철에서 이동할 때나 심심할 때나 하기 너무 재밌어요ㅎㅎ 저도 모르게 집중해서 하게 돼요!

### 5/5 — 최고의 스도쿠 앱

*2026-07-31*

스도쿠 중독자임 ㅇㅇ
진짜 많은 스도쿠 앱이 있지만 빠른 입력을 지원하는 앱은 별로 없음. 그 중에 하나를 마르고 닳도록 매일 몇 시간씩 플레이 했지만 그래도 아쉬운 점은 있었음. 
이것도 별생각없이 받았는데 내가 썼던 그 어떤 스도쿠 앱보다 좋음!! 원하는 모든 기능이 다 있음. 
빠른입력은 당연하고 UI 도 진짜 이쁘고 특히 초저녁 theme 애정함 ♥  아스트라 피처를 첨가해서 별자리 모으는 맛도 있고, 메모쓰는 칸에 컬러 표시되는 것도, 빠른 입력이 다른 숫자 눌러도 유지되는 것도, 햅틱마저도 최고임 👍🏻 정말 정성들여 만드신게 보임. 깨는 시간이 거의 반으로 단축됨. 잘 쓸게요 감사합니다!! 🫶🏻🫶🏻🫶🏻

### 5/5 — 간단하면서도 어려운

*2026-07-31*

상당히 시간도 잘 보내지고
디자인 뿐 아니라 상당히 잘 만들어진 스도쿠 입니다

### 5/5 — 깔끔한 스도쿠!!

*2026-07-31*

초급부터 해봤는데 재밌네요
어플 메뉴가 깔끔하고 플레이 화면도 이뻐요 별자리 해금하면서 스테이지 클리어 하는 것도 귀여워요 
퍼즐러버로서 손이 자주 갈 것 같아요 :)

### 5/5 — 스도쿠 재미와 보는 즐거움까지

*2026-07-31*

원래 스도쿠를 좋아해서 이것저것 다운받았었는데, 이 앱처럼 시간가는 줄 모르고 하는 스도쿠는 없었습니다~ 전체적인 인터페이스도 별자리로 꾸며져 있어서 보는 재미도 좋은 스도쿠! 추천합니다👍🏻

### 5/5 — 스도쿠 최고!

*2026-07-31*

별자리 좋아하고, 스도쿠 좋아하는데 직관적이고 그 두개 섞인거라니! 너무 예쁘고 좋아요! 마음다스리도 집중력 키우는데 이만한데 없는거 같아요

### 5/5 — 스트레스에좋은

*2026-07-31*

스트렉스에 딱인 만즐어주셔서ㅜ감사래요

### 5/5 — 별자리도 알게되고 스도쿠도 재밌어요

*2026-07-31*

스도쿠만 하다가 별자리가 추가되니까 더더욱 재미있는 게임입니다. 하나하나깨면서 모으는 재미가 있어서 계속 하게되네요
감사합니다

### 5/5 — 깔끔하니 좋아요

*2026-07-31*

스토쿠 좋아하는데
 화면이 눈에 잘 들어와요! 
숫자별 남은숫자가 나와서. 더 쉽게 가능하네요 .매일 도전 합니다!

## Frequently asked questions about Classic Sudoku

### Does Classic Sudoku have ads?

Yes, Classic Sudoku contains advertisements. Users can remove ads and gain unlimited hints with a one-time PRO purchase for a distraction-free experience.

### Can I play Classic Sudoku offline?

Yes, basic puzzles in Classic Sudoku can be played anytime and anywhere, even without an internet connection.

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

Classic Sudoku offers multiple difficulty levels, ranging from easy puzzles for beginners to more challenging boards for experienced players.

### How does Classic Sudoku help with brain training?

By engaging users in logic-based number puzzles, Classic Sudoku provides daily brain training. It helps users develop logical thinking and problem-solving skills through its gameplay.

### What is the PRO version of Classic Sudoku?

The PRO version of Classic Sudoku is an upgrade available via a one-time purchase. It removes advertisements and provides unlimited hints, offering a more comfortable and focused puzzle-solving experience.

### What devices is Classic Sudoku available on?

Classic Sudoku is available on iPhone and iPad devices.

### How often is Classic Sudoku updated?

The latest version of Classic Sudoku is 1.3.2, and it was last updated on June 18, 2026. Updates typically include new features, bug fixes, and performance improvements.

### What is the age rating for Classic Sudoku?

Classic Sudoku has an age rating of 4+, making it suitable for a wide range of players.

## Version history (last 5 releases)

### 1.3.7 — 2026-08-06

• Improved data compatibility to preserve your gameplay statistics and records from previous versions.
• Improved overall app stability and usability.

### 1.3.6 — 2026-07-21

Smart Hints are now more accurate and easier to follow.

• Fixed an issue where candidate-elimination hints could repeat in Expert and Extreme puzzles.
• Improved candidate analysis to prevent incorrect eliminations when using notes.
• Redesigned the hint panel so you can keep the board visible while following each step.
• Improved purchase, restore, and ad-loading reliability.
• Added other bug fixes and usability improvements.

### 1.3.5 — 2026-07-17

Compete with players around the world in the new Daily Rankings.

Added Game Center rankings for Today and the current 30-day season
The Daily Challenge card now opens the challenge calendar
View today’s puzzle and previous challenge records from the calendar
Daily puzzles and reset times now use the same UTC schedule worldwide
Replay previous puzzles in Practice Mode
Runs using hints, Auto Notes, skills, or other assistance are excluded from rankings
Improved duplicate-number feedback and Daily Challenge controls
Added ad privacy controls and improved localization and stability

### 1.3.4 — 2026-07-07

SudokuAstra 1.3.4 Update

• Fixed an issue where smart hint redirect messages could show the wrong selected cell coordinates.
• Fixed a Last-In hint issue that could treat incorrect cells as confirmed values and suggest an invalid hint.
• Added Game Center leaderboard score submission for Beginner difficulty.
• Improved the stability of hint guidance and score submission flows.

### 1.3.3 — 2026-07-02

This update improves the overall difficulty balance of Sudoku puzzles.

• Adjusted Expert and Extreme difficulties so they feel more clearly distinct.
• Improved Extreme puzzle generation to provide more consistently challenging boards.
• Refined Easy difficulty to avoid puzzles that feel too soft.
• Updated difficulty descriptions to better match the actual puzzle generation rules.
• Improved overall puzzle generation stability.

## More apps by ChanGyu Kang

- [SudokuBurst Block Puzzle](https://appshunter.io/ios/app/sudokuburst-block-puzzle/id6759514103)
- [Quick Memo+ToDo - PinDeck](https://appshunter.io/ios/app/quick-memo-plus-todo-pindeck/id6759880233)
- [Film Camera Filter MellowFilm](https://appshunter.io/ios/app/film-camera-filter-mellowfilm/id6762510830)
- [NumberOrder: Tap Puzzle](https://appshunter.io/ios/app/numberorder-tap-puzzle/id6763839987)
- [MellowDay Daily Vlog Diary](https://appshunter.io/ios/app/mellowday-daily-vlog-diary/id6766222900)

All apps by ChanGyu Kang: https://appshunter.io/developer/1869205578

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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 2026-08-24.*