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.

Sudoku Game

Classic 9x9 logic puzzles!

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🔢 Other Sudoku Games

More Sudoku variants for every skill level

Mini Sudoku
Mini Sudoku
Perfect for beginners! 4x4 grid puzzles using numbers 1-4.
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Sudoku (Easy)
Sudoku (Easy)
Classic 9x9 number puzzle - gentle start for new players.
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Sudoku (Medium)
Sudoku (Medium)
Step up the challenge with medium-difficulty puzzles.
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Sudoku (Hard)
Sudoku (Hard)
Tough logic puzzles for experienced solvers.
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Sudoku (Extreme)
Sudoku (Extreme)
The ultimate challenge - master-level puzzles only.
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Number Puzzle
Classic sliding puzzle with 7 board sizes - from 3x3 to 9x9 challenges!
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Tic-tac-toe
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🔎 Browse memory games

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