Sudoku 
Classic
Sudoku
The original 9×9 puzzle. Fill every row, column, and 3×3 box with the digits 1–9. Available in easy, medium, hard, and expert.
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Pick a variant and start solving. New puzzles are generated every day.
Beginner
4×4 Sudoku
A smaller grid using digits 1–4. Perfect for kids and first-time players who want to learn the rules quickly.
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Intermediate
6×6 Sudoku
A medium-sized grid with 2×3 boxes and digits 1–6. Great stepping stone between 4×4 and the full 9×9 puzzle.
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Advanced
Killer Sudoku
Combines Sudoku with Kakuro. Groups of cells (cages) must sum to a given total — no number can repeat within a cage.
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Variant
Jigsaw Sudoku
Replaces the standard 3×3 boxes with irregular jigsaw-shaped regions. Same rules, fresh challenge.
Play NowWhy Play Sudoku Here?
Everything you need for a great sudoku experience, all in one place.
100% Free
No subscriptions, no paywalls, no sign-ups. Just pick a puzzle and play instantly.
Notes & Pencil Marks
Toggle pencil mode to jot candidates in every cell — just like solving on paper.
Timer & Stats
Track your solve times and watch your skills improve over days, weeks, and months.
Hints When You're Stuck
Smart hints explain the next logical step so you can learn while you play.
More Sudoku Resources
Printable puzzles, an automated solver, and articles to sharpen your game.
The Ultimate Destination for Sudoku Online Puzzles
Whether you're a complete beginner or a seasoned solver, Sudoku Online Puzzles has something for everyone. Our growing library features classic 9×9 grids, smaller 4×4 and 6×6 boards for newcomers, and challenging variants like Killer Sudoku and Jigsaw Sudoku for advanced players.
How to Play Sudoku
Sudoku is a logic puzzle played on a grid divided into rows, columns, and smaller boxes. The goal is simple: fill every empty cell so that each row, column, and box contains each digit exactly once. No guessing is needed — every puzzle can be solved through pure deduction.
Sudoku Puzzles for Every Skill Level
Not sure where to start? Try our easy sudoku puzzles — they use more given digits so you can build confidence. Ready for more? Step up to medium, hard, or even expert grids that require advanced techniques like X-Wing, Swordfish, and naked pairs.
- Easy & Beginner Sudoku — Learn the basics with plenty of clues.
- Medium Sudoku — The sweet spot for daily practice.
- Hard & Expert Sudoku — Test your logic with fewer starting digits.
- Kids Sudoku (4×4 & 6×6) — Smaller grids that are fun for younger solvers.
Play Anytime, Anywhere
Our puzzles work seamlessly on desktop, tablet, and mobile. Pick up where you left off with auto-save, or download a printable PDF for your commute. New puzzles are generated every day so you'll never run out of challenges.
Frequently Asked Questions
Quick answers to common sudoku questions.
Sudoku is a logic-based number puzzle where you fill a 9×9 grid so that every row, column, and 3×3 box contains the digits 1 to 9 exactly once. No maths is required — just logic and deduction.
Yes! Every sudoku puzzle on Sudoku Online Puzzles is 100% free to play. No sign-up needed — just pick a game and start solving.
We offer classic 9×9 Sudoku, beginner-friendly 4×4 and 6×6 grids, Killer Sudoku (with cage sums), and Jigsaw Sudoku (with irregular regions). More variants are added regularly.
Absolutely. Visit our Printable Sudoku section to download and print puzzles in easy, medium, and hard difficulties — perfect for offline solving.
Enter your partially filled grid into our Sudoku Solver and it will find the solution instantly. It's a great learning tool — you can also step through the logic to understand each move.