Play Free Sudoku Online - Classic Logic Puzzle Game

Challenge your mind with classic 9x9 Sudoku puzzles. Click a square to select it, then choose a number to place. Perfect for brain training! Fill each row, column, and 3x3 box with digits 1-9. Explore more memory games or puzzle games.

Classic 9x9 logic puzzles!

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🔢 Other Sudoku Games

More Sudoku variants for every skill level

Mini Sudoku

Perfect for beginners! 4x4 grid puzzles using numbers 1-4.

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Sudoku (Easy)

Classic 9x9 number puzzle - gentle start for new players.

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Sudoku (Medium)

Step up the challenge with medium-difficulty puzzles.

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Sudoku (Hard)

Tough logic puzzles for experienced solvers.

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Sudoku (Extreme)

The ultimate challenge - master-level puzzles only.

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How to Play Sudoku

Simple rules

Objective: The goal is to fill the 9x9 grid with numbers so that each row, column, and 3x3 section contains all digits 1-9.
Gameplay: Click an empty cell to select it, then use the number palette to place a digit.
Controls: Use Undo to revert your last move or the Erase (⌫) button to clear a selected cell.
Winning: When all cells are correctly filled, you've solved the puzzle. Use Check to validate.

Strategy & Tips

Improve your solving speed

Start with Obvious Numbers: Look for rows, columns, or 3x3 boxes that already have many numbers filled in. These areas are easier to complete.
Use Notes Mode: Enable Notes mode to mark possible numbers in cells. This helps you see all possibilities before making a decision.
Look for Patterns: Scan for numbers that can only go in one specific cell within a row, column, or box.

Sudoku Benefits for Brain Health

Why puzzles are good for you

Improves Memory: Exercise your working memory and pattern recognition
Enhances Logic: Develop critical thinking and problem-solving skills
Reduces Stress: Focus on puzzles to relax and clear your mind
Prevents Cognitive Decline: Keep your brain active and sharp

Frequently Asked Questions

Common questions about Sudoku

What difficulty levels are available?

We offer multiple difficulty levels: Easy (default), Medium, Hard, and Extreme. Each level provides a different challenge suitable for various skill levels.

Is this game really free?

Yes, this online Sudoku game is 100% free to play. There are no downloads, no sign-ups, and no hidden costs. Just instant puzzle-solving fun!