Sudoku.

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HOW TO PLAY

Sudoku

Fill the 9x9 grid so every row, column, and 3x3 box contains the digits 1-9 with no repeats.

Controls

  • Click a cell, then press 1-9 (or tap the number pad) to fill it
  • Backspace/Delete or 0 clears a cell; arrow keys move the selection
  • Each generated puzzle has one solution. Red cells indicate repeated numbers in a row, column or box.
  • Easy, Medium and Hard leave 35, 45 and 55 empty cells respectively.
  • Pause or press P to take a break. Help and leaving the tab pause the timer; resume when ready.