Sudoku

How to play Sudoku

Sudoku is a number-placement puzzle on a 9×9 grid. Fill every empty cell so that each row, each column and each 3×3 box contains the digits 1 to 9 exactly once. Every puzzle here has one solution, and you can deal a new one as often as you like.

Select a cell, then pick a digit. Clashing digits turn red straight away. Use Notes to pencil in candidates, Undo to step back, and Hint to reveal a cell when you are stuck. Your puzzle is saved in your browser as you play.

• Players 1
• Mode Single player
• Plays on Phone, tablet and desktop
• Price Free, no sign-up

Sudoku rules

• Every row must contain the digits 1 to 9 exactly once.
• Every column must contain the digits 1 to 9 exactly once.
• Every 3×3 box must contain the digits 1 to 9 exactly once.
• The given digits cannot be changed.
• Each puzzle has exactly one solution.

Controls

Click / tap

Select a cell

1 - 9

Enter a digit

0, Backspace or Delete

Clear the cell

Arrow keys

Move the selection

N

Toggle notes

U or Ctrl+Z

Undo

H

Hint

Sudoku questions