Classic Sudoku - Star Sudoku
Daily Brain Training
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Classic Sudoku with a constellation journey. Enjoy daily challenges, rankings, multiple difficulty levels, helpful hints, collections, and an art gallery.
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.
more Version 1.3.8
• Added a special celebration for completing all 88 constellations in the collection.
• Improved puzzle generation and screen transitions for smoother, more reliable gameplay.
• Improved the reliability of Daily Challenge and leaderboard score submissions.
• Refined when update notifications appear for a more natural experience.
• Optimized interstitial ad frequency and preloading during gameplay.
• Improved saved data handling, localization, and overall app stability.
1.3.8 Aug 26
• Improved data compatibility to preserve your gameplay statistics and records from previous versions.
• Improved overall app stability and usability.
1.3.7 Aug 6
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.
1.3.6 Jul 21
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
1.3.5 Jul 17
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.
1.3.4 Jul 7
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.
1.3.3 Jul 2
This update improves game save stability and expands language support.
Improved how hint usage is saved and restored during ongoing games.
Improved game state saving when leaving the screen or moving the app to the background.
Enhanced consistency when continuing previously saved games.
Improved the stability of the update check process.
Added German, French, Spanish, and Simplified Chinese localizations.
Refined localized text for ads, purchases, hints, and settings.
1.3.2 Jun 18
This update refreshes the Home layout, improves season event behavior, and strengthens scoring, hint, and note consistency during play.
Reorganized the Home screen around Art Gallery, Daily Challenge, Classic Mode, and Season Event cards.
Improved season event handling so ongoing puzzles and medals can continue to be earned after the event period ends.
Adjusted the constellation journey so later stages become progressively more challenging.
Fixed a scoring issue that could occur after Undo and Redo.
Improved hint, auto-note, number pad, and completion checks so incorrect cells no longer affect candidate logic.
Stabilized Daily Challenge card buttons and season progress display.
1.3.1 Jun 9
This update makes Sudoku easier to start, more rewarding to return to, and smoother to play every day.
Refined the Home screen so Daily Sudoku and Constellation Journey are easier to access.
Added an Unlimited Classic Mode card with difficulty selection and random start.
Improved the Daily Challenge calendar with monthly medal progress and streak records.
Added support for replaying past Daily Challenges.
Added the new Season Observation Event. Complete 10 event puzzles and unlock limited medals.
Added event progress, remaining days, and next-medal guidance.
Added a Reduce Visual Effects option for a calmer play experience.
Improved hints, auto notes, ad-removal handling, localization, PrivacyInfo, and overall release stability.
1.3.0 Jun 5
- Updated Auto Notes as a Pro-only feature.
- Improved the default AI Hint count and guidance flow.
- Adjusted reward-based feature flows to match the current app experience.
- Improved puzzle generation, clear handling, and undo behavior stability.
- Refined some localized text and screen labels.
1.2.2 May 26
- Temporarily disabled ad display flows.
- Adjusted hint and auto-note rewards so they can be used without ads.
- Improved overall stability.
1.2.1 May 6
A smarter AI hint system arrives in Sudoku Astra
[4 new solving techniques]
- Hidden Pairs / Hidden Triples — uncover hidden patterns
- Box-Line Reduction — handle common patterns precisely
- XY-Wing — solve even the toughest puzzles
With 13 total techniques, every difficulty can now be solved through pure logic.
[Hint usage statistics]
See which techniques you use most and how often you reveal answers. Track your solving patterns visually in the Statistics screen.
[Result sharing card]
Share a beautiful cosmic-themed card featuring your constellation and score. You can also share constellations again from the Gallery.
[Unlimited mode highlighted]
Even after collecting all constellations, new puzzles are generated endlessly.
[Other improvements]
- Hint coach now gently guides you when the selected cell needs other cells solved first
- Technique-aware penalty: advanced techniques cost less, rewarding deeper learning
- Improved localized content reliability
- Performance optimizations and bug fixes
May your night sky always be full of stars.
1.2 May 5
We’ve improved usability and stability so you can enjoy Sudoku Astra more comfortably.
- Auto Notes can now be used after watching a rewarded ad.
- Improved navigation back to the Art Gallery after completing an Art Gallery puzzle.
- Improved support for iOS 16.
- Improved screen transitions and gameplay stability.
1.1.2 Apr 30
- Improved puzzle difficulty balance, especially Expert and Extreme modes.
- Fixed score issues where repeated correct entries could increase points incorrectly.
- Updated undo and erase behavior for answered cells.
- Added gameplay settings for haptics and timer display.
- General stability and usability improvements.
1.1.1 Apr 22
v1.1.0 — Major Update
* Interactive Tutorial
Learn by tapping! Try the new hands-on tutorial where you solve a mini puzzle to learn Sudoku rules naturally.
* Daily Challenge Calendar
Track your daily challenge records on a monthly calendar. Collect trophies and build your streak!
* Detailed Statistics
View games played, win rate, best time, average time, and top score for each difficulty level.
* Auto Notes (Pro)
Automatically fill in candidate numbers for all empty cells with one tap.
* Redo
Redo now works alongside Undo for precise move control.
* Completion Animation
Completing a row, column, or box triggers a glowing highlight effect.
* Number Lock (Long Press)
Long-press a number to lock it for quick consecutive placement.
* Duplicate Highlight
Duplicate numbers in the same row, column, or box are shown in red. (Toggleable in Settings)
* Error Display Toggle
Choose whether wrong numbers are shown instantly in Settings.
* iPad Landscape Mode
iPad now supports landscape layout with the board on the left and controls on the right.
* 5 New Languages
Added Spanish, Portuguese (Brazil), German, French, and Simplified Chinese. Now supports 8 languages.
* Share Results
Share your clear results with friends after completing a puzzle.
* Other Improvements
- Improved smart auto-complete suggestion
- Accurate undo/redo state restoration
- Enhanced iPad orientation detection
- Various stability improvements and bug fixes
1.1.0 Apr 12
New Feature: Added an auto-fill function for the last remaining cell in a 3x3 grid.
Sudoku Astra is constantly evolving and striving to provide you with an even better puzzle experience.
We hope you enjoy a smoother and more convenient journey under the starlight!
1.0.8 Mar 27
Sudoku Astra is always striving to improve and provide you with the best puzzle experience.
In this update, we’ve improved overall stability and fixed minor bugs for a smoother journey. Enjoy the starry puzzles!
1.0.7 Mar 25
Sudoku Astra is constantly evolving to provide you with a better puzzle experience.
In this update, we've improved overall stability and upgraded our AI hints to ensure smoother gameplay.
We hope you continue to enjoy your relaxing Sudoku journey under the starlight!
1.0.6 Mar 23
Sudoku Astra is always striving to improve and provide you with the best puzzle experience.
In this update, we’ve improved overall stability and fixed minor bugs for a smoother journey. Enjoy the starry puzzles!
1.0.5 Mar 22
Sudoku Astra is always striving to improve and provide you with the best puzzle experience.
In this update, we’ve improved overall stability and fixed minor bugs for a smoother journey. Enjoy the starry puzzles!
1.0.4 Mar 20
Sudoku Astra is always striving to improve and provide you with the best puzzle experience.
In this update, we’ve improved overall stability and fixed minor bugs for a smoother journey. Enjoy the starry puzzles!
1.0.3 Mar 19
Sudoku Astra is always striving to improve and provide you with the best puzzle experience.
In this update, we’ve improved overall stability and fixed minor bugs for a smoother journey. Enjoy the starry puzzles!
1.0.2 Mar 18
Sudoku Astra is always striving to improve and provide you with the best puzzle experience.
In this update, we’ve improved overall stability and fixed minor bugs for a smoother journey. Enjoy the starry puzzles!
1.0.1 Mar 17
Version 1.3.8
• Added a special celebration for completing all 88 constellations in the collection.
• Improved puzzle generation and screen transitions for smoother, more reliable gameplay.
• Improved the reliability of Daily Challenge and leaderboard score submissions.
• Refined when update notifications appear for a more natural experience.
• Optimized interstitial ad frequency and preloading during gameplay.
• Improved saved data handling, localization, and overall app stability.
more Version 1.3.8 Aug 26
Data Used to Track You The following data may be used to track you across apps and websites owned by other companies:
Data Not Linked to You The following data may be collected but it is not linked to your identity:
Identifiers Usage Data Diagnostics