### Additions and Improvements - Added Undo support, fully integrated with actions like color marking - Added multi-color marking; supports continuous coloring by holding down the mouse button - Added a wide range of color themes - Added selection styles and cursors; included previews for the grid and selection states - Grid line settings are now freely adjustable - Chain drawing (dashed lines) supports adjustable thickness and spacing - Key bindings for cross-border input now support key combinations - Optimized multi-selection with two modes: "Mouse Multi-select" and "Key Multi-select" - Mouse Multi-select supports continuous selection via click-and-drag - Key Multi-select supports customizable modifier keys (e.g., Shift) - Optimized selection, note-taking, and highlighting logic for "Number-First" mode - Optimized candidate highlighting and added a feature introduction - Automatic note clearing now synchronizes with Variant Sudoku rules - In "Fog of War" mode, notes can now be added to locked cells, though numbers cannot be entered directly - Optimized technique hints; added options to select or deselect all techniques - Added an option to exit training mode from the technique hints menu - Added an option to hide tutorial prompts - Added a button to exit the tutorial - Merged the Pause menu and the ESC menu - Simplified the difficulty of daily goals - Optimized the difficulty sorting for Sudoku techniques ### Variant Sudoku Improvements - Optimized display scaling for Variant Sudoku overlays (e.g., XV, Odd/Even) to fit various screen sizes and devices - Irregular (Jigsaw) Sudoku regions now use distinct region lines; original standard region lines removed - Optimized Killer Sudoku cage borders, dividers, and top-left digit displays - Generated a "Normal" difficulty puzzle bank for Killer Sudoku - Optimized Variant Sudoku rules and automatic note-clearing logic ### Sudoku Techniques - Audited the Sudoku technique puzzle bank; regenerated example puzzles that did not meet requirements - Fixed issues with multiple solutions in Sudoku technique tutorial levels - Corrected erroneous descriptions regarding the "Empty Rectangle" technique - Fixed inconsistencies between automatic and manual chain drawing results Optimized the logic for determining strong and weak links during the chain-drawing process - Drag-selecting no longer accidentally triggers the highlighting of identical numbers

• Added an achievement system • Killer Sudoku supports coloring multiple game boards, expanding color schemes to 16 • Added note color marking; identical numbers are highlighted. • Added a highlight switch for related cells, shortcut key binding, and custom fonts. • Added splash screen theme adaptation and PC version adaptation. • Added a note projection switch. • Added settings for chain line thickness, log, and war mode. • Optimized the unique cycle algorithm and modified Sudoku tips. • Fixed abnormal note display in Killer Sudoku 9x9 grids. • Fixed incomplete candidate entries for one-click notes after restarting. • Fixed the inability to batch fill multiple selections in number priority mode. • Fixed display issues with some images in dark mode. • Fixed other known issues.

- 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

### 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.

- 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

- 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.

- 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.

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.

- 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

- 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

- Increased touch range for classic Sudoku swipe gestures - Fixed issue where the remaining number of numbers on the numeric keypad was constantly updated.

- 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.

- 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

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

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.

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.

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

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

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

add somes bugs

Added ipad adaptation, thanks to bilibili @Oct_28 for the correction

add new bug fix old bug