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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.
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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