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What’s New Version 1.6.0
- Added new Sudoku variations: Diagonal, Window, Reverse King, Odd/Even, Thermometer, Reverse Knight, Discontinuous, XV, Dot, Arrow, Zigzag
- Added Sudoku tricks: BUG+1, Avoidable Rectangle, Hidden Rectangle, Hidden Unique Rectangle, WXYZ-Wing, AHS-Chain
- Added new variations to Daily Sudoku
- Added trick hint candidate source settings (current note/real note)
- Reorganized Sudoku trick examples
- Reorganized the puzzle bank based on current note strategy
- Killer Sudoku editor supports a wider range of data structures
- Fixed an issue with incorrect L-Wing trick hint text
- Fixed an issue with unclear Sudoku trick hint text for empty rectangles
- Automatically filters out any characters other than numbers during data entry
- Fixed an issue with the selected state when canceling multiple selection notes in Classic Sudoku
- Changed Sudoku saving to real-time saving
- Fixed known bugs
Description
Happy Sudoku is an intelligent Sudoku game developed with Flutter, combining AI technology with innovative level design. The game features a dynamic infinite-scrolling level selection system, providing players with a unique gaming experience.
#### Core Features
1. **Innovative Level System**
* **Dynamic Level Path**: Programmatically generated infinite scrolling curve path for level display
* **Stage-based Layout**: Levels divided into multiple stages, each containing a fixed number of levels
* **Smart Loading**: Lazy loading technology for optimized performance and memory usage
* **Smooth Experience**: Intelligent scroll monitoring and preloading mechanism
* **Visual Feedback**: Current level highlighting, clear stage separation, and special character display
2. **Smart Game Features**
* **AI Hint System**: Intelligent analysis of solving strategies
* **Note Mode**: Support for candidate number recording in cells
* **Highlight Hints**: Highlight same numbers for assistance
* **Error Detection**: Real-time input error detection
* **Undo Function**: Support for undoing previous moves
3. **Game Interface**
* **Professional Sudoku Board**: 9x9 standard grid with clear 3x3 sub-grid division
* **Smart Input System**: Bottom number pad supporting number input and note mode
* **Visual Feedback**: Selected cell highlighting with related cells (row, column, box) highlighting
* **Status Display**: Timer, error counter (heart display), game progress
* **Theme Switching**: Multiple preset themes (green, blue, sakura, red, deep purple)
4. **Game Mechanics**
* **Difficulty Levels**: From beginner to master level
* **Progress Saving**: Independent save for each level
* **Achievement System**: Record solving time and success rate
* **Error Limit**: Maximum 3 errors allowed
* **Haptic Feedback**: Operation vibration feedback
5. **Personalization**
* **Theme Customization**: Multiple preset themes with real-time switching
* **Haptic Settings**: Customizable vibration feedback
* **Interface Optimization**: Dark mode support, customizable font size
* **Operation Habits**: Customizable gestures and operation methods
* **Multilingual**: Support for 18 languages
6. **Technical Features**
* **Performance Optimization**: Smooth gaming experience, low power consumption
* **Offline Mode**: Full offline support
* **Auto-save**: Real-time progress saving
* **Data Security**: Secure user data storage
* **Continuous Updates**: Regular feature optimization and content updates
#### Usage Scenarios
1. **Daily Entertainment**
* **Commute Time**: Solve puzzles during travel
* **Relaxation**: Unwind after work or study
* **Waiting Time**: Pass time while waiting
* **Bedtime Relaxation**: Light game for better sleep
* **Family Entertainment**: Suitable for all ages
2. **Learning and Training**
* **Mathematical Thinking**: Develop logical reasoning
* **Concentration**: Improve focus and attention
* **Memory**: Exercise memory through puzzle solving
* **Thinking Training**: Develop systematic thinking
* **Stress Relief**: Relax through puzzle solving
3. **Professional Training**
* **Sudoku Competition**: Preparation for competitions
* **Brain Training**: Professional brain training tool
* **Solving Techniques**: Learn advanced solving methods
* **Speed Training**: Improve solving speed
* **Difficulty Challenge**: Challenge high-difficulty puzzles
Accessibility
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Version history 21 versions
Build 886682053v1.6.02026-06-26 05:01:43
- Added new Sudoku variations: Diagonal, Window, Reverse King, Odd/Even, Thermometer, Reverse Knight, Discontinuous, XV, Dot, Arrow, Zigzag
- Added Sudoku tricks: BUG+1, Avoidable Rectangle, Hidden Rectangle, Hidden Unique Rectangle, WXYZ-Wing, AHS-Chain
- Added new variations to Daily Sudoku
- Added trick hint candidate source settings (current note/real note)
- Reorganized Sudoku trick examples
- Reorganized the puzzle bank based on current note strategy
- Killer Sudoku editor supports a wider range of data structures
- Fixed an issue with incorrect L-Wing trick hint text
- Fixed an issue with unclear Sudoku trick hint text for empty rectangles
- Automatically filters out any characters other than numbers during data entry
- Fixed an issue with the selected state when canceling multiple selection notes in Classic Sudoku
- Changed Sudoku saving to real-time saving
- Fixed known bugs
Build 886001967v1.5.62026-05-22 14:24:53
### Classic Sudoku
- The puzzle bank has been reorganized, sorted by a combination of "difficulty level" and "solution steps," containing a total of 90 × 1000 = 90,000 Sudoku puzzles.
- Added 22 advanced Sudoku techniques: Empty Rectangle, Group AIC, Discontinuous Cycles, Same Number Coloring, Different Number Coloring, Extended Rectangle, Array Short of One, Merged Array, Spanning Array, Block Array, Deadlock Array, Deadlock Triple Array, Pseudo Array, Firework Array, Balanced Array, ALS-W-Wing, ALS-XY-Wing, M-Wing, H-Wing, S-Wing, L-Wing, AHS-XZ
- Added custom error detection methods: Answer Error Detection, Conflict Error Detection
- Added automatic unique number output function
- Added double cell value highlighting function, identical notes automatically display the same color
- Expanded Sudoku technique tutorial levels, each technique now includes 10 examples.
- Tips and tricks now include "Disable Tips" and "Help Me" functions.
- Tips and tricks window now remembers location settings.
- Optimized tips and tricks algorithm and speed.
- In number priority mode, clicking a selected number again will deselect it.
- In grid priority mode, clicking a selected grid again will deselect it.
- Fixed several known issues.
### Other Updates
- Added custom note thickness.
- Added "Daily" dimension statistics to the statistics function.
- Settings menu supports collapsing.
- Added custom killer Sudoku.
- Added directory categorization to "My Puzzles → Favorites".
- Added "Beginner" difficulty level to Daily Sudoku.
Build 884792013v1.5.52026-04-23 06:12:59
- Classic Sudoku
- Added an automatic chain clearing switch
- Optimized chain drawing; adjacent notes are now connected using larger curves
- Fixed the issue of accidental deletion of notes in Classic Sudoku
- Daily Sudoku
- Added weekly and daily calendars; improved page aesthetics
- Added daily goals and status display
- Supports viewing and playing past daily Sudoku puzzles
- Killer Sudoku
- Solver and collections now sum the remaining candidate numbers in the cage, not the entire cage
- Added cage coloring function; cages can be colored.
- Added custom cage color function
- Fixed the issue of being unable to complete Killer Sudoku
- My Puzzles
- Added import function; supports file and link imports; supports Classic Sudoku and Killer Sudoku
- Removed average clues and replaced with the number of solved puzzles
- My Puzzle list is now the default directory view
- My Puzzle directory now includes randomly generated puzzles
- Others
- Sudoku Challenge; independent progress for each difficulty level
Build 884415917v1.5.42026-04-12 17:05:48
- Classic Sudoku:
- Added Chain Drawing Feature:
- Basic Chains: Automatic substitution of strong and weak links.
- Intra-Cell Chains: Chains can be drawn between candidate numbers within the same cell.
- Chain Validation: Hints are provided to indicate valid chains.
- Multiple Chains: Multiple chains can exist simultaneously.
- Custom Colors: Users can customize the colors for [Normal Chains / Invalid Chains].
- Cross-Cell Chains: When a chain spans two or more cells situated along the same baseline, it is displayed as a curved line.
- Rule Hints: When displaying rule hints, prerequisite candidate notes are temporarily auto-filled, regardless of whether the "One-Tap Notes" feature is enabled.
- Sudoku Techniques: Display the count of available techniques within each category group.
- New Sudoku Techniques Added: X-Chain, XY-Chain, AIC, Grouped X-Chain, Remote Pairs, Continuous Loops, ALS-XZ, ALS-Chain, XYZ-Wing.
- Killer Sudoku: Added Color Marking feature.
- Other:
- The "Answer" button has been moved to the title bar.
- Feature Prompts: Added a "Do not show again" option; these prompts can be restored via the Settings menu.
- "My Puzzles": Added a custom folder management feature; long-pressing allows for batch moving of Sudoku puzzles.
- Added Custom Note Size setting.
Build 883816151v1.5.32026-03-27 14:39:09
- Classic Sudoku:
- Added a feature allowing quick number entry by double-clicking on a unique note.
- A smarter hint system that only provides useful hints based on the current note.
- Optimized w-wing text.
- Fixed incorrect practice problems related to the cut-and-paste technique.
- More detailed difficulty levels for Sudoku techniques.
- Error detection: If an answer exists, it's marked as incorrect; if no answer exists, it's marked as incorrect based on row, column, or 3x3 repetition.
- Added Sudoku techniques: Expanded fish types (Sowrdfish, Jellyfish, Finned X-wing, Finned Swordfish, Finned Jellyfish, Sashimi X-wing, Siamese X-wing, Franken X-wing, Mutant X-wing).
- Killer Sudoku:
- Added number priority/grid priority; number priority allows for quick highlighting.
- Added the "[Keep Valid Subsets]" function to collections.
- Fixed the issue of ghost subsets in collections.
Build 883322881v1.5.22026-03-13 03:49:05
Important Updates to "Classic Sudoku":
- The in-game [Hint] function has been changed to [Tips and Tricks] (Important Update!!!!!!!!!)
- Added Sudoku tricks (Unique Remainder, Intuitive Blocks, Cut and Fill, Explicit Pairs, Explicit Three-Arrays, Explicit Four-Arrays, Implicit Pairs, Implicit Three-Arrays, Implicit Four-Arrays, Unique Explicit Four-Arrays, X-Wing, Unique Rectangle, Unique Ring, XY-Wing, W-wing, Skyscraper, Double-Line Kite, Turbot)
- Added tips and tricks priority settings
Important Updates to "Killer Sudoku":
- Killer Sudoku has added 60,000 datasets, including 30,000 unique solutions for Killer Sudoku and 30,000 multi-solution datasets for Master Killer Sudoku
- Solver operation changed to [Remove Combinations] instead of [Remove Notes]
- Solver added [Multi-Cage Summation] + [Multi-Cage Exclusion]
- Solver records the [Exclusion Status] of candidate combinations, i.e., [Excluded/Not Excluded]
Other Updates:
- Added [Infinite Error] mode
- Added [Sudoku Coordinates] display function
- Added [Color Markers] and [Breathing Light] functions for Classic Sudoku
- Added color marker settings in [Settings]
- Added [Copy Sudoku Puzzle] for Classic Sudoku, which can be quickly imported when creating a Sudoku puzzle
- Added note highlighting settings [Number Highlighting/Grid Highlighting]
- Added sharing Sudoku (current puzzle/original puzzle)
- Moved [Smart Hints] for Classic Sudoku to [Settings]
- Optimized number highlighting, optimized the color difference between the same candidate number and the filled number
- Fixed the issue in [Color Settings] where the color of the pre-filled number remained unchanged, only the color of the number to be filled changed.
Build 881838825v1.4.92026-01-26 07:10:17
- Updated the classic Sudoku dataset (all Sudoku puzzles have only one solution)
- Updated the number of Sudoku puzzles: Total number is 61,600, including: Easy (16x100), Normal (30x1000), and Expert (30x1000)
- Added automatic note cleanup function to Killer Sudoku
- Fixed a bug where background music disappeared when entering numbers
- Optimized the hint function for classic Sudoku
- Fixed the issue of delayed saving when generating answers for custom puzzles
Build 881525526v1.4.82026-01-20 18:58:11
- Changed App Icon
- Added automatic answer generation to custom Sudoku
- Adapted to more screens and models (iPhone, iPad, iPad mini/dual-screen phone, iPhone SE (short-screen phone))
- Theme follows system (dark/light)
- Intuitive settings page with improved UI (differentiated between game settings and general settings)
- Input modes [grid priority/number priority]
- Classic Sudoku candidate highlighting moved to settings
- Removed one-click real-time note calculation, added automatic note cleanup function (automatically clears notes with the same row, column, and 3x3 number)
- Quick completion (automatically completes when only one candidate number remains on the board)
- Game sound effects (click, input, error, elimination, undo)
- Background music default value changed to 50% (to avoid affecting sound effects)
- Added [incomplete/completed] status to daily Sudoku
- Added quick import of Sudoku puzzles to custom Sudoku
Build 881190446v1.4.72026-01-04 15:51:53
- Increased touch range for classic Sudoku swipe gestures
- Fixed issue where the remaining number of numbers on the numeric keypad was constantly updated.
Build 881175288v1.4.62026-01-03 12:42:38
- Added background music function
- Added forced portrait mode
- In Killer Sudoku's bright mode, identical numbers will be brighter
In Killer Sudoku's dark mode, the cage border will be brighter
In Killer Sudoku, the selection state can be deselected when a single number is selected.
Build 881085075v1.4.52025-12-30 11:13:36
- General
- UI Update
- Added Daily Sudoku
- App Entry Change
- Favorites Function
- Row, Column, and Sudoku Colors Follow Theme Color
- Number Color Settings (Custom Number Colors)
- Game Color Settings (Custom Board Colors)
- App Statistics
- Range Statistics [Year, Month, Week]
- Each Game Record: Time Spent, Hints Count, Recalls, Total Duration, Thinking Time, Longest Thinking Time, Number of Clues
- Total Statistics, Game Overview, Time Spent Analysis, Achievement Records, Game Performance, Auxiliary Usage, Difficulty Distribution
- Standard Sudoku
- Added Quick Swipe Input
- Added [Multi-Select/Single Selection] Functionality in Notes Mode
- Added [Default/Add/Subtract] Functionality in Notes Mode
- Same Number Highlighting is Now the Default Functionality
- Killer Sudoku (500 Levels Built-in for Each Difficulty)
- Solver (Grid Calculation + Component Calculation)
- Notes (Centered + 3x3 Grid)
- Button Behavior (Default/Add/Subtract)
- Single/Multiple Selection (Click + Swipe to Select)
- Highlighting of identical numbers in [Single/Multiple Selection] mode
Build 879413537v1.3.42025-11-02 12:36:51
1. Save and exit function can save [button state] + [recorded notes]
2. Fixed the issue of note prompts being displayed in dark mode
3. Added version number to settings
Build 879331840v1.3.32025-10-30 03:21:37
1. Increased touch area for numbers in the selection area.
2. Eraser button can erase notes.
3. Added [Game Color Settings] to the settings page, allowing customization of game background color, game text color, and game border color.
Build 879076237v1.3.22025-10-22 08:52:56
1. Added a one-click note feature to enable/disable real-time calculations.
2. Hint function: Add corresponding number hints to notes.
3. Customizable colors for numbers in the selected area and on the board.
Build 878978458v1.3.02025-10-16 22:05:39
1. Increased the number of candidate areas
2. Added highlighting for candidate areas
3. Added smart fill-in
4. Added AI-powered prompts
5. Increased the number of medium difficulty levels to 30
6. Added Sudoku color styles
7. Fixed some bugs
Build 878412275v1.2.12025-09-25 05:09:10
1. Increased game difficulty and difficulty levels
2. Smoothly increased difficulty, prompting users every 5 levels to decide whether to increase the difficulty
3. Added a "answer" button; click to view sample answers
4. Added a "hint" button for feedback
5. Enhanced some pages
6. Fixed some bugs
7. The app name changes based on the selected language version on your phone
Build 878397727v1.2.02025-09-24 21:44:09
1. Increased game difficulty and difficulty levels
2. Smoothly increased difficulty, prompting users every 5 levels to decide whether to increase the difficulty
3. Added an answer button; click to view sample answers
4. Added feedback for the hint button
5. Beautified some pages
6. Fixed some bugs
Build 876922764v1.1.02025-08-02 12:36:23
add somes bugs
Build 876276758v1.0.22025-07-10 07:18:23
Added ipad adaptation, thanks to bilibili @Oct_28 for the correction
Build 875774944v1.0.12025-06-23 07:48:22
add new bug
fix old bug
Build 875493531v1.02025-06-15 11:40:09
No pricing data captured yet — comparisons appear once the app has paid storefronts or in-app purchases.
Availability 1 of 1 storefronts
| Region | Language | Price | Ratings | Avg | Version |
|---|---|---|---|---|---|
| US | en-US | Free | 2 | 5.0 | 1.6.0 |
Change log 25 changes · US
✎
releaseNotes updated
- Added new Sudoku variations: Diagonal, Window, Reverse King, Odd/Even, Thermometer, Reverse Knight, Discontinuous, XV, Dot, Arrow, Zigzag
- Added Sudoku trick
✎
description updated
Happy Sudoku is an intelligent Sudoku game developed with Flutter, combining AI technology with innovative level design. The game features a dynamic infinite-s
✎
subtitle updated
AI Sudoku Easy Start Fast
✎
name updated
Happy Sudoku-Sudoku Game
◆
Version 1.6.0 released
- Added new Sudoku variations: Diagonal, Window, Reverse King, Odd/Even, Thermometer, Reverse Knight, Discontinuous, XV, Dot, Arrow, Zigzag
- Added Sudoku tricks: BUG+1, Avoidable Rectangle, Hidden Rectangle, Hidden Unique Rectangle, WXYZ-W
◆
Version 1.5.6 released
### Classic Sudoku
- The puzzle bank has been reorganized, sorted by a combination of "difficulty level" and "solution steps," containing a total of 90 × 1000 = 90,000 Sudoku puzzles.
- Added 22 advanced Sudoku techniques: Empty Rectangle
◆
Version 1.5.5 released
- Classic Sudoku
- Added an automatic chain clearing switch
- Optimized chain drawing; adjacent notes are now connected using larger curves
- Fixed the issue of accidental deletion of notes in Classic Sudoku
- Daily Sudoku
- Added weekly an
◆
Version 1.5.4 released
- Classic Sudoku:
- Added Chain Drawing Feature:
- Basic Chains: Automatic substitution of strong and weak links.
- Intra-Cell Chains: Chains can be drawn between candidate numbers within the same cell.
- Chain Validation: Hints are provide
◆
Version 1.5.3 released
- Classic Sudoku:
- Added a feature allowing quick number entry by double-clicking on a unique note.
- A smarter hint system that only provides useful hints based on the current note.
- Optimized w-wing text.
- Fixed incorrect practice prob
◆
Version 1.5.2 released
Important Updates to "Classic Sudoku":
- The in-game [Hint] function has been changed to [Tips and Tricks] (Important Update!!!!!!!!!)
- Added Sudoku tricks (Unique Remainder, Intuitive Blocks, Cut and Fill, Explicit Pairs, Explicit Three-A
◆
Version 1.4.9 released
- Updated the classic Sudoku dataset (all Sudoku puzzles have only one solution)
- Updated the number of Sudoku puzzles: Total number is 61,600, including: Easy (16x100), Normal (30x1000), and Expert (30x1000)
- Added automatic note clean
◆
Version 1.4.8 released
- Changed App Icon
- Added automatic answer generation to custom Sudoku
- Adapted to more screens and models (iPhone, iPad, iPad mini/dual-screen phone, iPhone SE (short-screen phone))
- Theme follows system (dark/light)
- Intuitive set
◆
Version 1.4.7 released
- Increased touch range for classic Sudoku swipe gestures
- Fixed issue where the remaining number of numbers on the numeric keypad was constantly updated.
◆
Version 1.4.6 released
- Added background music function
- Added forced portrait mode
- In Killer Sudoku's bright mode, identical numbers will be brighter
In Killer Sudoku's dark mode, the cage border will be brighter
In Killer Sudoku, the selection state can
◆
Version 1.4.5 released
- General
- UI Update
- Added Daily Sudoku
- App Entry Change
- Favorites Function
- Row, Column, and Sudoku Colors Follow Theme Color
- Number Color Settings (Custom Number Colors)
- Game Color Settings (Custom Board Colors)
- App
◆
Version 1.3.4 released
1. Save and exit function can save [button state] + [recorded notes]
2. Fixed the issue of note prompts being displayed in dark mode
3. Added version number to settings
◆
Version 1.3.3 released
1. Increased touch area for numbers in the selection area.
2. Eraser button can erase notes.
3. Added [Game Color Settings] to the settings page, allowing customization of game background color, game text color, and game border color.
◆
Version 1.3.2 released
1. Added a one-click note feature to enable/disable real-time calculations.
2. Hint function: Add corresponding number hints to notes.
3. Customizable colors for numbers in the selected area and on the board.
◆
Version 1.3.0 released
1. Increased the number of candidate areas
2. Added highlighting for candidate areas
3. Added smart fill-in
4. Added AI-powered prompts
5. Increased the number of medium difficulty levels to 30
6. Added Sudoku color styles
7. Fixed some bug
◆
Version 1.2.1 released
1. Increased game difficulty and difficulty levels
2. Smoothly increased difficulty, prompting users every 5 levels to decide whether to increase the difficulty
3. Added a "answer" button; click to view sample answers
4. Added a "hint" butt
◆
Version 1.2.0 released
1. Increased game difficulty and difficulty levels
2. Smoothly increased difficulty, prompting users every 5 levels to decide whether to increase the difficulty
3. Added an answer button; click to view sample answers
4. Added feedback for t
◆
Version 1.1.0 released
add somes bugs
◆
Version 1.0.2 released
Added ipad adaptation, thanks to bilibili @Oct_28 for the correction
◆
Version 1.0.1 released
add new bug
fix old bug
◆
Version 1.0 released