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Play Sudoku Online

Challenge your mind with our professional Sudoku puzzle game. Six difficulty levels, smart hints, note-taking mode, and mistake tracking — all in your browser, no sign-up needed.

Mistakes
0/3
Time
00:00
0Score
5hints left

Sharpen Your Mind with Every Puzzle

Sudoku is more than just a numbers game — it's a workout for your brain. Regular practice improves concentration, logical reasoning, and short-term memory. Whether you play for five minutes or an hour, each solved puzzle gives your mind a satisfying challenge and a confidence boost. Best of all, no math skills are needed — just pure logic.

What Is Sudoku?

Sudoku is a logic-based number placement puzzle played on a grid. In the classic 9×9 version, the goal is to fill every row, column, and 3×3 box with the digits 1 through 9, with no repetition. Our 6×6 variant uses digits 1–6 in 2×3 boxes — perfect for beginners or a quick brain warm-up. Every puzzle has exactly one valid solution, discoverable through pure deductive reasoning.

How to Play Sudoku

  1. 1

    Choose a Difficulty

    Pick Easy for a relaxed session, or push yourself with Expert, Master, or Extreme. Higher difficulties remove more starting numbers.

  2. 2

    Select a Cell

    Click any empty cell on the board to select it. Use arrow keys to navigate between cells without lifting your hands from the keyboard.

  3. 3

    Enter a Number

    Press a digit key or tap a number in the pad below the board. The number appears in the cell and is instantly checked for conflicts.

  4. 4

    Use Notes Mode

    Toggle Notes mode to pencil in candidate numbers without committing. Notes help you track possibilities across rows, columns, and boxes.

  5. 5

    Correct Mistakes

    Use Undo to step back one move, or Erase to clear a cell. You have three mistake allowances before the game ends — choose carefully!

Sudoku Tips & Strategies

  • Scan Rows and Columns

    Before placing a number, scan every row and column in that box to eliminate possibilities. Often a single candidate will remain.

  • Find Naked Singles

    Look for cells where only one number can legally fit. These 'naked singles' are the easiest placements and unlock harder cells.

  • Use Pencil Marks

    Activate Notes mode and fill in all possible candidates for empty cells. When a candidate appears only once in a row, column, or box, it must go there.

  • Work the Boxes

    Focus on a box that's nearly complete. Adding one or two numbers to a dense box often cascades — unlocking neighbors in the same row and column.

  • Take Breaks

    If you're stuck, step away for a minute. A fresh pair of eyes often spots the move that was hiding in plain sight.