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Sudoku

Clear your mind. Fill the grid. One number at a time.

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How to play Sudoku

Sudoku is a logic puzzle played on a 9×9 grid divided into nine 3×3 boxes. The goal is simple: fill every row, every column, and every 3×3 box with the digits 1 through 9, with no digit repeating in any row, column, or box.

Some cells are pre-filled as clues — the harder the difficulty, the fewer clues you start with. No arithmetic is involved; pure logic is enough to solve any valid Sudoku puzzle.

Tips for beginners

  • Start with rows, columns, or boxes that already have the most numbers filled in.
  • Use the Notes mode to pencil in candidate numbers for a cell when you're not sure.
  • If a digit can only go in one place in a row, column, or box — that's where it belongs.
  • Use the Check button to spot mistakes early before they cascade.
  • Use hints sparingly — you only get 3 per puzzle.