Game

Sudoku: how to play

Sudoku means filling a 9×9 grid with the numbers 1 to 9. All our puzzles have a single solution, checked when they are generated.

Controls

Tap a square and tap a number, or use the keyboard. Use the arrow keys to move and Delete or 0 to clear a square.

Rules

  • Each row must contain the numbers 1 to 9 without repeating.
  • So must each column.
  • So must each 3×3 box.
  • The starting numbers cannot be changed.

Tips

  • Start with the numbers that appear most among the initial clues.
  • Look for squares where only one number fits.
  • If two squares in a row accept only the same two numbers, remove them from the rest of the row.

Frequently asked questions

What is the daily Sudoku?

The same puzzle for all players, which changes at midnight (UTC).

How many clues does each level have?

Easy 40, medium 32 and hard 26 given squares.

Does it warn me about mistakes?

Yes, wrong numbers are marked in red and counted.