Printable Sudoku Generator

Generate fresh Sudoku puzzles with unique solutions and print them with an answer key. Free, fast, and everything runs on your device.

Choose a difficulty and click New puzzle.

Free for personal and classroom use. Selling or publishing these puzzles (books, worksheets, products) requires a Premium commercial licence — watermark-free downloads included.

How to use the Sudoku Generator

  1. Pick a difficulty: Easy, Medium, or Hard. Easier puzzles start with more given numbers.
  2. Click New puzzle to generate a fresh grid. Each puzzle is created from a fully solved board, then numbers are removed to the target difficulty.
  3. Solve on screen or use Show solution to reveal the answer at any time.
  4. Choose a print layout — one puzzle per page or two per page to save paper — then click Print to get the puzzles followed by a solutions page.

Why use ZillaKit's Sudoku Generator?

This printable Sudoku generator creates genuine puzzles, not scanned images. It starts by building a complete, valid 9 × 9 solution using a randomized backtracking solver, then removes cells one at a time to reach the target number of givens for your chosen difficulty. For easy and medium puzzles it verifies that the puzzle still has exactly one solution after each removal, so you never get an ambiguous grid with multiple answers. Because it runs entirely in your browser, you can generate an endless supply of unique puzzles with no signup, no watermarks, and nothing uploaded to a server. The classic 3 × 3 box borders are drawn clearly, and the print output is ink-friendly black-on-white: pick one puzzle per page for a full-size grid, or two per page to save paper, and a separate solutions page is always included for easy checking. It is perfect for teachers making warm-up worksheets, care homes and clubs printing puzzle packs, or anyone who just wants a fresh Sudoku to solve on paper.

FAQ

Are the printable Sudoku puzzles free?

Yes. You can generate and print unlimited puzzles for free, with no signup and no watermarks on the printout.

Do the puzzles have a unique solution?

Easy and medium puzzles are verified to have exactly one solution as cells are removed. Hard puzzles are generated to the difficulty target for a tougher challenge; the included solution is always a valid answer.

How many given numbers does each difficulty have?

Easy puzzles have roughly 38 to 45 givens, medium have about 30 to 36, and hard have around 25 to 28. Fewer givens generally make a puzzle harder.

Can I print two puzzles on one page?

Yes. Choose the "2 puzzles per page" layout to save paper. A solutions page is always printed after the puzzles.

Is anything uploaded to a server?

No. Puzzles are generated with JavaScript right in your browser, so nothing you do is sent anywhere.