Sudoku Generator

Generate, play and print unique-solution Sudoku puzzles, including 4-up worksheets.

About this tool

Generate, solve and play 9×9 Sudoku puzzles. Each removed clue is checked so the puzzle has one solution. The selected label controls clue density only; it is not a rating of human solving techniques.

Buttons

New puzzle: regenerate.
Hint: fill one random unknown cell with the correct digit.
Check: report wrong / blank cells (wrong values are also coloured red as you type).
Reveal solution: fill the entire grid.