QR code generator
Create free QR codes for links, text, Wi-Fi, email, phone, and SMS. Customize colors and size, then download PNG or SVG. No sign-up, no expiry.
Sudoku generator
Generate printable sudoku puzzles from easy to expert, each with one unique solution. Multiple per page, answer keys, and play online.
Play puzzle 1
0:00How to use Sudoku generator
Generate printable sudoku puzzles in four difficulty levels — easy, medium, hard and expert. Every puzzle is checked by a solver to have exactly one solution, and clues are placed symmetrically like a classic newspaper sudoku.
- Make 1 to 100 puzzles at once, with 1, 2, 4 or 6 per page
- Answer key pages for every puzzle
- Play the first puzzle on screen with a timer, hints and error checking
- US Letter or A4 PDF, or print directly
Difficulty is set by the number of starting clues: easy 38–42, medium 31–34, hard 27–29 and expert 23–25. Puzzles are generated fresh on your device every time, so you will never run out.
Sudoku generator FAQs
Is Sudoku generator free?
Sudoku generator is a free online tool on ReallyUseful.Tools. No account is required.
Does Sudoku generator run in my browser?
Sudoku generator is designed to run in your browser where supported, so files can stay on your device instead of being uploaded to a server.
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