Sudoku

Play Sudoku online for free. Multiple difficulty levels, hints, notes mode, and statistics tracking. Challenge your brain with the classic number puzzle game.

Difficulty

Medium

Time

0:00

Mistakes

0/3

Progress

0/81

Click 'New Game' to start playing!

How to Play

Select a Cell
Click or tap any empty cell to select it. Use arrow keys to navigate.

Fill Numbers
Click numbers 1-9 on the numpad or use keyboard to fill cells.

Notes Mode
Toggle notes mode to add pencil marks for possible numbers.

Sudoku Rules
Fill every row, column, and 3x3 box with numbers 1-9 without repeating.

Statistics

Games Played

Games Won

--:--

Best Time

Win Rate

What is Sudoku?

Sudoku is a logic-based number placement puzzle that has captivated millions worldwide. The game consists of a 9x9 grid divided into nine 3x3 boxes. The objective is to fill every row, column, and 3x3 box with the numbers 1 through 9, with each number appearing exactly once in each row, column, and box. Our online Sudoku game offers multiple difficulty levels, helpful features like hints and notes mode, mistake tracking, and detailed statistics to help you improve your solving skills.

Key Features

Four difficulty levels: Easy, Medium, Hard, and Expert
Notes mode for pencil marks and candidate tracking
Hint system with 3 hints per game
Mistake counter with 3 lives per game
Undo functionality to reverse moves
Auto-highlight of related cells (same row, column, and box)
Same number highlighting for easy tracking
Progress tracking showing filled cells
Game timer to track your solving speed
Comprehensive statistics with win rate and best time
Keyboard support for faster gameplay
Mobile-friendly touch controls
Dark mode support
No registration required - play instantly

How to Play Sudoku

Click 'New Game' to start with a fresh puzzle at your chosen difficulty
Click or tap on any empty cell to select it
Use the number pad below the grid or press keys 1-9 to enter a number
The game will highlight incorrect entries in red
Use Notes mode (pencil icon) to mark possible candidates in cells
Press the hint button if you're stuck (3 hints available per game)
You can make up to 3 mistakes before the game ends
Use the Undo button to reverse your last move
Complete the puzzle by filling all 81 cells correctly
Try to solve faster and with fewer hints to improve your statistics

Sudoku Tips & Strategies

Start with Easy puzzles to learn the basic techniques
Look for 'naked singles' - cells where only one number is possible
Scan rows, columns, and boxes for 'hidden singles'
Use notes to track candidates when puzzles get harder
Focus on boxes, rows, or columns that are almost complete
Look for numbers that appear 8 times to find the 9th placement
Practice the 'pointing pairs' technique for intermediate puzzles
Learn X-wing and Swordfish patterns for expert puzzles
Don't guess - Sudoku puzzles have logical solutions
Take breaks if you're stuck - fresh eyes often spot solutions

Have feedback? Report bugs or suggest features