Free Sudoku Puzzle Generator
Pick a difficulty and generate a printable sudoku puzzle with a guaranteed unique solution, plus an optional solution sheet. Everything runs in your browser — no sign-up, no app.
Frequently asked questions
- Does every puzzle have exactly one solution?
- Yes. Each puzzle is checked as it's generated to make sure it has exactly one valid solution, the same guarantee as a published sudoku book.
- What's the difference between the difficulty levels?
- Difficulty is controlled by how many starting clues are left on the grid — Easy leaves around 38 clues, Medium around 30, Hard around 24, and Expert around 20. Fewer clues means more deduction is required to solve it.
- Can I print the solution too?
- Yes. Check "Include solution page" and a second, fully solved grid prints after the puzzle.
- Is this sudoku generator free?
- Yes, completely free with no sign-up. Free puzzles include a small footer credit; a one-time purchase can remove it.