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Sudoku Master — Free Online 9×9 Puzzle

Train your brain with freshly generated Sudoku puzzles across Easy, Medium, and Hard modes — instant mistake feedback included.

Explore more puzzles: 2048 Classic · Wordle Unlimited.

How to Play Sudoku

  1. Click any empty cell on the 9×9 grid to select it.
  2. Press keys 1–9 on your keyboard or tap a number on the on-screen keypad.
  3. Ensure every row, column, and 3×3 box contains the digits 1 through 9 with no duplicates.