Sudoku

About Sudoku

Solve a nine-by-nine number puzzle by deduction. Every row, column, and three-by-three region must contain each digit exactly once. Choose a random puzzle or the daily puzzle, then select a difficulty and casual or hardcore play. Notes track possible digits; Undo and Erase let you revise a decision, while Hint can help when you are stuck. The board highlights related cells to make patterns easier to follow. Begin with the fullest rows, columns, and boxes. Notes help you track candidates without guessing.

How to play Sudoku

1. 1

   Know your goal

   Fill every row, column, and 3×3 box with the digits 1–9, without repeats.

2. 2

   Get comfortable with the controls

   Select a cell and type a number or use the number pad. N toggles notes; Backspace erases; Ctrl/Cmd + Z undoes.

3. 3

   Build your strategy

   Begin with the fullest rows, columns, and boxes. Notes help you track candidates without guessing.

Frequently asked questions about Sudoku