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Classic 9×9 number puzzle with easy, medium, and hard difficulty.
Play classic Sudoku in your browser. Choose easy, medium, or hard difficulty — puzzles are generated fresh every game. Fill in every row, column, and 3×3 box with the digits 1–9 without repeating. Errors are highlighted instantly. A timer tracks your speed and your best times are saved to the leaderboard.
Sudoku provides a classic 9x9 number puzzle experience directly in the browser with freshly generated puzzles across multiple difficulty levels. Users benefit from instant error highlighting, a built-in speed timer, and local leaderboard tracking for best times without needing any software installation or account creation.
Good to know: This tool is focused purely on standard single-player web puzzles; users requiring advanced puzzle variations, printed puzzle books, or offline play may need alternative solutions.
Learn how to play and solve classic 9×9 Sudoku puzzles with real-time error checking and difficulty levels.
Select your preferred difficulty level
Choose between easy, medium, or hard difficulty settings to generate a fresh 9×9 logic puzzle.
Identify empty cells in the grid
Look for empty squares within the rows, columns, and 3×3 boxes that need to be filled with digits 1–9.
Input numbers into the empty squares
Click a cell and enter a number, ensuring that each digit appears only once per row, column, and 3×3 section.
Monitor the grid for instant feedback
Check for highlighted errors as you play to correct mistakes immediately and refine your logic.
Complete the puzzle to record time
Fill every cell correctly to stop the timer and save your performance results to the leaderboard.
Estimated time: PT10M
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