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. Difficulty controls how many cells start blank; the generator only removes a cell if the puzzle still has a unique solution.
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.