Sudoku Master 2025

What is Sudoku?

Sudoku is a logic-based number puzzle game where players need to fill a 9×9 grid with digits from 1 to 9, ensuring that each row, column, and 3×3 subgrid contains all digits without repetition. Sudoku originated in 18th-century Switzerland, while the modern version was invented by American architect Howard Garns in 1979.

Game Rules

The 9×9 grid is divided into nine 3×3 subgrids
Each row, column, and subgrid must contain digits 1-9
Each digit can appear only once in each row, column, and subgrid
Players must deduce all empty cell numbers based on the given digits

Difficulty Levels

The game offers multiple difficulty levels to meet different player needs:

Beginner

Perfect for beginners, provides simple basic numbers

Easy

Suitable for players with some foundation, increases difficulty and challenge

Medium

Ideal for experienced players, offers moderate difficulty numbers

Hard

For challenging players, increases difficulty and complexity

Expert

For players seeking ultimate challenge, provides the most difficult number combinations

Game Features

This game provides rich functionality:

Input modes: including normal fill, notes mode, erase, and highlight
Auto-save: game progress is automatically saved, no worry about accidental closure
Load game: resume previously saved games anytime to continue the challenge
Game statistics: detailed recording of game data to track your progress
Difficulty selection: switch between different difficulties anytime to meet various challenge needs
Auto-check: optional automatic checking of input number correctness
Portrait and landscape support: comfortable gaming experience in both orientations
Hint function: use hints when stuck to get assistance

How to Play

Basic Operations:

Tap empty cells to select them
Use the bottom number keypad to input digits
Use mode toggle buttons to switch input modes:
- Write mode: directly fill in numbers
- Notes mode: record possible numbers, small digits display in cells
- Erase mode: clear filled numbers
- Highlight mode: highlight same numbers for easier analysis
Top-left menu access: game help, statistics, and settings
Top-right menu game management: start new game, reset current game, save and load games

Write

Notes

Erase

Highlight

Hint

Check

Special Operations:

Long press numbers: quickly switch between write mode and notes mode
Double-tap cells: clear cell content
Portrait/landscape switching: automatically adapts to screen orientation changes

Tips and Strategies

Here are some Sudoku solving techniques:

Elimination method: analyze existing numbers to exclude impossible options
Only choice method: find rows, columns, or subgrids where only one position can fit a specific number
Candidate recording: use notes mode to record possible numbers for each empty cell
Block analysis: analyze relationships between two subgrids to find definite number positions
Start with simple areas: prioritize solving areas with more given clues
Pair handling: identify pairs and triplets to exclude possibilities in other cells
X-Wing technique: identify rectangular arrangements of specific numbers to exclude possibilities in certain rows/columns
Fish techniques: identify constraint relationships of specific numbers across multiple rows and columns

Advanced tip: Proper use of the highlight function can help you identify number distribution patterns faster and improve solving efficiency.

Healthy Gaming Tips

Sudoku is a puzzle game that helps exercise logical thinking and concentration. To maintain healthy gaming habits:

Take breaks: rest for 5-10 minutes after every 30-45 minutes of play
Maintain proper posture: avoid prolonged head-down position to prevent neck fatigue
Eye protection tips: maintain appropriate distance and adjust screen brightness
Moderate gaming: arrange gaming time reasonably and maintain life balance