How It Works

Three steps to a perfect printable Sudoku

Pick Difficulty

Choose from Easy (38 clues) to Expert (24 clues). Each puzzle has exactly one solution.

Generate

Click Generate and get a unique, valid Sudoku puzzle instantly in your browser.

Download

Export the puzzle and its solution as print-ready 300 DPI PNG files.

Features

Everything you need for Sudoku in activity books

4 Difficulty Levels

From Easy (38 clues, great for beginners) to Expert (24 clues, serious challenge). Every puzzle has exactly one valid solution.

Multiple Puzzles per Page

Print 1, 2, 4, or 6 puzzles on a single page. Perfect for activity books with space-efficient layouts.

Print-Ready Quality

Export at 300 DPI on US Letter or A4 paper. Clean grids with bold 3×3 box borders, ready for your activity book.

100% Free & Private

Everything runs in your browser. No upload, no server, no login. Generate unlimited Sudoku puzzles instantly.

Printable Sudoku Puzzle Generator for Activity Books

Create professional Sudoku puzzles for children's activity books, brain training worksheets, or classroom printables in seconds. Choose from four difficulty levels — Easy for beginners and kids, Medium for casual players, Hard for experienced solvers, and Expert for a serious challenge. Every puzzle is guaranteed to have exactly one valid solution.

Print 1, 2, 4, or 6 puzzles per page for flexible activity book layouts. Each Sudoku is generated entirely in your browser using a backtracking algorithm with randomized cell removal and solution uniqueness verification. Download both the puzzle and solution at 300 DPI — print-ready on US Letter or A4 paper.

Frequently Asked Questions

Is the Sudoku generator really free?: Yes, 100% free with no limits. Everything runs in your browser — no account, no credits, no watermarks on the puzzle area.
Does every puzzle have exactly one solution?: Yes. The generator creates a complete valid grid, then removes numbers while verifying that the puzzle still has a unique solution.
Can I print multiple puzzles on one page?: Yes! Choose 1, 2, 4, or 6 puzzles per page. Each puzzle is independently generated with the selected difficulty.
Can I use these Sudoku puzzles in a book I sell?: Absolutely. Puzzles you generate are yours to use commercially — in activity books, worksheets, or any other project.
What do the difficulty levels mean?: Easy has 38 given numbers, Medium has 30, Hard has 26, and Expert has 24. Fewer given numbers means a harder puzzle.
What resolution are the downloaded files?: All exports are 300 DPI PNG files sized for the selected page format (US Letter or A4). They are print-ready.

Printable Sudoku Generator