It's a shorthand
“Sudoku” comes from the Japanese phrase Sūji wa dokushin ni kagiru, which basically means “digits must stay single.” Perfect description of the rules.
Name origin
Sudoku Generator — Printable 9×9
Puzzle Settings & Actions
Tip: Keys — N = New, P = Print, S = Save PNG, D = Save PDF.
Puzzle
Sudoku — Medium
Solution (Preview)
Note: The PDF can include the solution even if the preview is hidden.
About this generator
This Sudoku puzzle generator creates fresh, printable 9×9 puzzles on demand. Whether you want a quick brain warm‑up, a classroom activity, or a stack of puzzles for a trip, it gives you a clean grid and a matching solution with just a few clicks. The generator is designed to be easy to use while still producing puzzles with a single, valid solution.
Sudoku works on a simple rule: place the digits 1–9 so that every row, every column, and every 3×3 box contains each number exactly once. To create a puzzle, the generator first builds a complete, valid Sudoku grid. It then removes numbers while checking that only one solution remains. The fewer numbers left behind, the more challenging the puzzle tends to be.
Difficulty levels are based on how many “givens” remain on the board. Easy puzzles keep more numbers, which makes logical deductions faster. Hard puzzles remove more numbers, which requires deeper reasoning and a longer solve time.
- Easy: about 43 givens
- Medium: about 33 givens
- Hard: about 25 givens
- Choose your difficulty level (Easy, Medium, or Hard).
- Select how many puzzles you want to generate.
- Click Generate to create your puzzles and the solution preview.
- Use the Show/Hide Solution button if you want to practice first.
- Download the printable PDF when you are ready.
The PDF output is handy for offline use, making it great for travel packs, classrooms, or puzzle nights. Teachers can print a set for students, and puzzle lovers can keep a binder of daily challenges. Because everything runs in your browser, your puzzles are created instantly without uploads or tracking.
If you are new to Sudoku, start with an easy grid and focus on scanning rows, columns, and boxes for missing digits. As you improve, try medium and hard puzzles for more advanced logic. This generator makes it simple to practice at any level, and every click gives you a unique puzzle you can solve again and again.
Everything runs locally in your browser. No uploads, no tracking.
5 Fun Facts about Sudoku
Endless supply
There are 6,670,903,752,021,072,936,960 valid 9×9 grids. Generating one per second would still take 200 trillion years—15,000+ times the age of the universe.
Combinatorics
17 clues is enough
Mathematicians proved in 2012 that you need at least 17 given numbers for a standard puzzle with a unique solution. Nobody has ever found a valid 16-clue grid.
Clue limit
Born in Indiana
The puzzle was invented by American architect Howard Garns in 1979 for Dell Magazine as “Number Place,” long before Japan popularized it worldwide.
History
Symmetry is just vibes
Newspaper puzzles often delete digits in rotationally symmetrical pairs because it feels hand-crafted—even though symmetry doesn’t change solvability.
Design detail