Continuously play puzzles without stopping. Perfect for long sessions! Complete as many as you can.
No timer, no pressure. Just relax and solve at your own pace. Perfect for mindful puzzle-solving.
Printable Sudoku Puzzles
Generate and print Sudoku puzzles for offline solving. Perfect for classrooms, travel, or when you prefer solving with pen and paper!
Select Difficulty Level
Easy
Perfect for beginners and casual solvers
- ✓ More given numbers
- ✓ Simple logic required
- ✓ Great for learning
Blank Grid
Empty template for creating your own puzzles
- ✓ Empty 9×9 grid
- ✓ Perfect for teaching
- ✓ Create your own puzzles
Medium
Balanced challenge for regular players
- ✓ Moderate difficulty
- ✓ Requires basic techniques
- ✓ Most popular level
Hard
For experienced Sudoku enthusiasts
- ✓ Fewer given numbers
- ✓ Advanced strategies needed
- ✓ Challenging but fair
Expert
Ultimate challenge for Sudoku masters
- ✓ Minimal given numbers
- ✓ Expert techniques required
- ✓ Maximum difficulty
💡 Printing Tips
- Print Settings: Use "Portrait" orientation for best results
- Paper Size: Standard 8.5" × 11" (Letter) or A4
- Solution: Each PDF includes the solution on a separate page
- Reuse: Generate unlimited puzzles - each print creates a new puzzle!
Why Print Sudoku Puzzles?
Perfect for Travel
No internet needed. Solve puzzles on planes, trains, or anywhere offline.
Classroom Use
Teachers can print multiple copies for students. Great for logic development!
Pen & Paper Experience
Many prefer the tactile experience of solving with traditional methods.
Senior Friendly
Larger print size options available. Easier on the eyes than small screens.
Learn Sudoku - How to Play Sudoku Puzzles
Interactive Tutorial
Understanding the Grid
Sudoku is played on a 9×9 grid divided into nine 3×3 boxes. Each row, column, and 3×3 box must contain the numbers 1-9 without repetition.
Starting Strategy
Look for rows, columns, or boxes that already have many numbers filled in. These give you the best clues for where to place the next number.
Using Notes
Use the notes feature to mark possible numbers for each cell. This helps you track multiple possibilities and make logical deductions.
Process of Elimination
If a number can only go in one cell in a row, column, or box, that's where it belongs. Eliminate impossible options systematically.
Solving Techniques
Beginner Techniques
Naked Singles
When a cell can only contain one possible number, fill it in immediately. This is the most basic and essential technique.
Hidden Singles
When a number can only go in one cell within a row, column, or box, even if that cell has other possibilities.
Intermediate Techniques
Naked Pairs
When two cells in a row, column, or box can only contain the same two numbers, you can eliminate those numbers from other cells in that unit.
Pointing Pairs
When a candidate number appears only in one row or column within a box, it can be eliminated from that row or column outside the box.
Box/Line Reduction
If a number in a box is confined to a single row or column, eliminate that number from the rest of the row or column outside the box.
Advanced Techniques
X-Wing
When a candidate appears in exactly two rows and two columns forming a rectangle, you can eliminate that candidate from other cells in those columns (or rows).
Swordfish
An extension of X-Wing using three rows and three columns. Very powerful for Expert-level puzzles.
XY-Wing
A chain of three cells with specific bi-value patterns that allows elimination of candidates in cells that see both endpoints.
Strategy Tips
Start with Easy Wins
Begin by filling in the most obvious numbers. Look for rows, columns, or boxes with the most numbers already filled.
Use Notes Liberally
Don't try to keep everything in your head. Use the notes feature to track possibilities for each cell.
Scan Systematically
Check each number 1-9 in turn, looking for where it can be placed. This systematic approach prevents missing opportunities.
Take Breaks
If you're stuck, pause and come back later. Fresh eyes often spot patterns you missed before.
Focus on Constraints
Look for cells with the fewest possibilities. These are usually the easiest to solve and can trigger chain reactions.
Practice Daily
Regular practice improves pattern recognition. Start with Easy puzzles and gradually increase difficulty.
Common Mistakes to Avoid
Guessing Too Early
Avoid guessing unless absolutely necessary. Use logical deduction and techniques first. Guessing can lead to cascading errors that are hard to fix.
Not Updating Notes
When you fill in a number, remember to remove it from notes in all related cells (same row, column, and box). Outdated notes lead to mistakes.
Rushing Through Easy Numbers
Even obvious placements should be double-checked. A single mistake early on can make the puzzle unsolvable later.
Ignoring Patterns
Advanced techniques exist for a reason. Learn to recognize patterns like pairs, triples, and pointing pairs to solve harder puzzles.
Playing Above Your Level
Start with easier difficulties and work your way up. Jumping to Expert too quickly leads to frustration and bad habits.
Practice Puzzles
Ready to practice? Go back to the Play tab and select your difficulty level!
Frequently Asked Questions About Sudoku
Everything you need to know about Sudoku Web. Find answers to common questions about our features, game modes, and more.
Getting Started
Is Sudoku Web completely free?
Yes, Sudoku Web is 100% free to use with no ads, no signup required, and no hidden costs. Play unlimited Sudoku puzzles across all difficulty levels without any restrictions.
Do I need to create an account?
No account needed! Your statistics and progress are saved locally in your browser using localStorage, ensuring complete privacy while maintaining your data across sessions on the same device.
Does Sudoku Web work on mobile devices?
Yes! Sudoku Web is fully mobile-responsive and optimized for smartphones and tablets. All features work seamlessly on any device, with touch-friendly controls and large buttons for easy gameplay.
Game Modes
What is Endless Mode?
Endless Mode provides unlimited Sudoku puzzles at your chosen difficulty level. There's no limit to how many puzzles you can play, making it perfect for practice, entertainment, and improving your skills. Each puzzle is randomly generated, ensuring you'll never run out of fresh challenges.
What is Zen Mode?
Zen Mode offers a relaxed Sudoku experience with no timer and no mistake tracking. It's perfect for casual play, learning new techniques, or when you want to solve puzzles without any pressure. Ideal for beginners or anyone who wants to enjoy Sudoku at their own pace.
How often do daily challenges refresh?
Daily challenges refresh every 12 hours - once in the morning (AM) and once in the evening (PM). This gives you two chances per day to complete challenges and build your streak. Complete both daily challenges to maximize your XP and maintain your streak!
Features & Difficulty
What difficulty levels are available?
Sudoku Web offers 4 difficulty levels:
- Easy: Perfect for beginners with more given numbers and simple logic
- Medium: Balanced challenge requiring basic solving techniques
- Hard: For experienced players needing advanced strategies
- Expert: Ultimate challenge for Sudoku masters with minimal clues
How do I use hints?
Click the hint button (💡 lightbulb icon) to reveal a correct number in one empty cell. You have 3 hints per puzzle. Use them wisely when you're stuck! Hints are great learning tools to see which numbers work in difficult situations.
Can I print Sudoku puzzles?
Yes! Use our Printable tab to generate PDF puzzles in Easy, Medium, Hard, or Expert difficulty. Each PDF includes the puzzle and solution on separate pages. Perfect for offline solving, classroom use, or when you prefer pen and paper!
What are pencil marks/notes?
Pencil marks (also called notes or candidates) let you write small numbers in cells to track possible values. Click the pencil icon to enable note mode, then click numbers to add/remove them as possibilities. This is essential for solving harder puzzles!
Benefits & Learning
Is Sudoku good for your brain?
Yes! Playing Sudoku regularly provides numerous cognitive benefits:
- Improves logical thinking and pattern recognition
- Enhances memory and concentration skills
- Boosts problem-solving abilities in daily life
- Reduces mental decline in seniors
- Provides stress relief through focused activity
It's an excellent mental exercise for all ages!
How do I improve at Sudoku?
Visit our Learn tab for interactive tutorials covering basic rules, solving techniques, and advanced strategies. Start with Easy puzzles and gradually increase difficulty as you master each technique. Practice consistently and don't be afraid to use hints when learning new patterns!
Technical & Data
How is my data stored?
All your statistics, progress, and preferences are stored locally in your browser using localStorage. This means:
- ✓ Complete privacy - no data sent to servers
- ✓ Works offline - play without internet
- ✓ Persists forever - data stays until you clear it
- ✗ Device-specific - not synced across devices
- ✗ Lost if cleared - clearing browser data removes stats
Can I play offline?
Yes! Once you've loaded the page, you can play Sudoku offline. All puzzles are generated locally in your browser. Your progress and statistics are also saved locally, so no internet connection is required after the initial page load.
What browsers are supported?
Sudoku Web works on all modern browsers including Chrome, Firefox, Safari, Edge, and mobile browsers. JavaScript and HTML5 support are required. For the best experience, use the latest version of your preferred browser.
Still Have Questions?
Ready to start playing? Head to the Play tab to begin your Sudoku journey, or visit Learn for interactive tutorials!
Your Sudoku Statistics
Storage: All your stats are saved locally in your browser and persist forever.
Lost if: You clear browser data, use incognito mode, or switch browsers/devices.
Privacy: Your data stays on your device - nothing is sent to any server.
Player Level
Daily Challenge
Puzzle Collections
Personal Records
Progress Overview
Total Games Played
Games Won
Win Rate
Average Time
Performance by Difficulty
Easy
Medium
Hard
Expert
Achievements
First Victory
Complete your first puzzle
Speedster
Complete a puzzle in under 5 minutes
Perfect Game
Complete a puzzle with 0 mistakes
Hot Streak
Win 3 days in a row
Week Warrior
Win 7 days in a row
Expert Player
Complete an Expert puzzle
Century Club
Complete 100 puzzles
Brain Power
Complete a puzzle without using hints
Lightning Fast
Complete a puzzle in under 3 minutes
Marathon Runner
Play 10 games in one day
Flawless Streak
Complete 5 perfect games in a row
Dedication
Win 30 days in a row
Sudoku Master
Complete 10 Expert puzzles
Explorer
Play all difficulty levels
Efficiency Expert
Complete a puzzle in under 50 moves
Half Thousand
Complete 500 puzzles
Speed Demon
Average under 5 minutes across 10 games
Comeback King
Win after making 5+ mistakes
Perfectionist
Complete 50 puzzles with 0 mistakes
Legendary
Complete 1000 puzzles
About Sudoku Web
Welcome to Sudoku Web!
Hi, I'm Jerry Hsiang, the creator of Sudoku Web. I built this platform because I genuinely believe in the power of puzzle games to enhance our mental well-being and cognitive abilities.
I've been playing Sudoku for decades now, and it has become an essential part of my daily routine. What started as a casual pastime has evolved into a lifelong passion. Each morning, I challenge myself with a puzzle, and I've found that this simple practice has had a profound impact on keeping my mind sharp and focused.
My Journey with Puzzles
My love for puzzles didn't start with Sudoku—it began with Solitaire. My grandmother was the first person to introduce me to Solitaire when I was a child. I have fond memories of sitting at her kitchen table, watching her expertly shuffle and place cards with a calm, focused demeanor. She taught me not just the rules, but the patience and strategic thinking required to win.
To this day, my grandmother still plays Solitaire as part of her daily routine. At her age, she's as sharp as ever, and I'm convinced that her dedication to these mental exercises has played a significant role in maintaining her cognitive health. Her example inspired me to explore other puzzle games, which eventually led me to discover Sudoku.
I have a deep fondness for playing Solitaire myself. Like Sudoku, it helps me relieve daily stress and keeps my mind engaged. There's something incredibly therapeutic about the rhythm of solving puzzles—whether it's arranging cards or filling in numbers on a grid.
Why I Built Sudoku Web
After years of playing Sudoku on various platforms, I noticed that many were cluttered with ads, required subscriptions, or lacked the features I wanted. I decided to create something better—a clean, free, and feature-rich Sudoku experience that anyone could enjoy.
Sudoku Web is designed with the following principles in mind:
- 100% Free: No paywalls, no subscriptions, no hidden costs.
- No Ads: Play without distractions or interruptions.
- Privacy First: All your statistics and progress are saved locally on your device. Nothing is sent to any server.
- Accessibility: Whether you're a beginner or an expert, there's a difficulty level for you.
- Continuous Improvement: I actively listen to user feedback and regularly update the platform with new features and improvements.
Benefits of Playing Sudoku
Based on my personal experience and extensive research, playing Sudoku regularly can:
- Improve Memory: Regularly solving puzzles strengthens your short-term memory.
- Enhance Concentration: Sudoku requires focus and attention to detail.
- Reduce Stress: The meditative nature of solving puzzles can help calm your mind.
- Boost Logical Thinking: Each puzzle is a logic exercise that sharpens your analytical skills.
- Promote Mental Agility: Keeping your brain active with puzzles may help reduce cognitive decline as you age.
For me, Sudoku isn't just a game—it's a mental workout, a stress reliever, and a source of daily satisfaction. I hope Sudoku Web provides you with the same benefits it has given me.
Commitment to Excellence
Sudoku Web is a labor of love, and I'm committed to making it the best free Sudoku platform available. I regularly add new features based on user feedback, optimize performance, and ensure the experience remains smooth across all devices.
Some of the features I've added based on community requests include:
- Daily Challenges that refresh every 12 hours
- Printable puzzles for offline play
- Zen Mode for stress-free gameplay
- Statistics tracking and achievements
- Dark mode for comfortable night-time play
Get in Touch
I'd love to hear from you! Whether you have feedback, feature requests, or just want to share your Sudoku journey, feel free to reach out.
Email: Contact Us
You can also check out my other projects and writings on my blog.
Thank you for playing Sudoku Web. Happy puzzling!
— Jerry Hsiang
© 2026 Sudoku Web by Armillary Sphere LLC. All rights reserved.
Privacy Policy
Last Updated: January 20, 2026
At Sudoku Web, we take your privacy seriously. This Privacy Policy explains how we collect, use, and protect your information when you use our website.
1. Information We Collect
Local Storage Data
Sudoku Web stores data locally on your device using browser localStorage. This includes:
- Game Progress: Your current puzzle state, time elapsed, and difficulty settings
- Statistics: Game history, win rates, best times, and achievement progress
- Preferences: Theme settings (dark/light mode), game mode preferences
- Daily Challenge Data: Completion status and streak information
Important: All of this data is stored only on your device. We do not have access to this information, and it is never transmitted to our servers or any third party.
Analytics and Cookies
Sudoku Web does not use analytics tools, tracking cookies, or any third-party scripts that collect your personal information. We do not track your browsing behavior, IP address, or any identifying information.
2. How We Use Your Information
Since all data is stored locally on your device:
- We do not collect any personal information from you
- We do not share your data with third parties
- We do not sell your data to advertisers or marketing companies
- We do not track your activity across websites
Your game data exists solely on your browser and is used only to enhance your gaming experience.
3. Data Retention and Deletion
How Long We Keep Data
Since we don't collect or store any data on our servers, there is nothing for us to retain. All data persists on your device until you choose to delete it.
How to Delete Your Data
You can delete all Sudoku Web data at any time by:
- Clearing your browser's localStorage for sudoku-web.com
- Clearing your browser's cache and site data
- Using your browser's "Clear browsing data" feature
Note: Deleting this data will reset all your statistics, progress, and achievements.
4. Third-Party Services
Sudoku Web does not integrate with any third-party services that collect user data. We do not use:
- Google Analytics or similar analytics platforms
- Social media tracking pixels
- Advertising networks
- Payment processors (since the site is 100% free)
The only external links on Sudoku Web are to our blog and contact email, which do not transmit any data from this site.
5. Children's Privacy
Sudoku Web is safe for users of all ages, including children. Since we do not collect any personal information, we do not knowingly collect information from children under 13. Parents can feel confident allowing their children to use Sudoku Web without privacy concerns.
6. Security
While we do not collect or store any user data on our servers, we take the following security measures:
- Our website is served over HTTPS to ensure secure connections
- We do not use any third-party scripts that could compromise your privacy
- All game logic runs locally in your browser
The security of your locally stored data depends on your device and browser security settings.
7. Your Rights
Since we do not collect personal data, traditional data privacy rights (such as the right to access, correct, or delete data we hold) do not apply. However, you have complete control over the data stored locally on your device, as described in Section 3.
8. Changes to This Privacy Policy
We may update this Privacy Policy from time to time to reflect changes in our practices or for legal reasons. Any changes will be posted on this page with an updated "Last Updated" date.
If we ever introduce features that collect user data, we will update this policy and notify users prominently on the website.
9. Contact Us
If you have any questions or concerns about this Privacy Policy, please contact us:
Email: Contact Us
Summary
In short: Sudoku Web respects your privacy completely. We don't collect, store, share, or sell any of your personal information. All your game data stays on your device, and you're in full control of it. We believe gaming should be private, free, and enjoyable without compromise.
Terms of Service
Last Updated: January 20, 2026
Welcome to Sudoku Web. By accessing or using our website at sudoku-web.com (the "Website"), you agree to be bound by these Terms of Service ("Terms"). Please read them carefully.
1. Acceptance of Terms
By using Sudoku Web, you confirm that:
- You are at least 13 years of age, or have parental/guardian consent to use the Website
- You agree to comply with these Terms and all applicable laws
- You understand that your use of the Website is at your own risk
If you do not agree to these Terms, please do not use the Website.
2. Description of Service
Sudoku Web provides a free online Sudoku gaming platform with the following features:
- Interactive Sudoku puzzles in multiple difficulty levels
- Daily challenges that refresh every 12 hours
- Printable puzzle generation
- Statistics tracking and achievements (stored locally on your device)
- Learning tutorials and game modes
- Dark/light theme options
We reserve the right to modify, suspend, or discontinue any feature or the entire service at any time without notice.
3. User Conduct
While using Sudoku Web, you agree not to:
- Use the Website for any illegal or unauthorized purpose
- Attempt to reverse engineer, decompile, or extract the source code
- Use automated tools (bots, scrapers) to access or interact with the Website
- Interfere with or disrupt the Website's servers or networks
- Attempt to gain unauthorized access to any part of the Website
- Transmit viruses, malware, or any harmful code
- Impersonate any person or entity
- Violate any applicable laws or regulations
4. Intellectual Property Rights
Our Content
All content on Sudoku Web, including but not limited to:
- Website design, layout, and graphics
- Puzzle generation algorithms
- Text, images, and user interface elements
- Code and software
...are owned by Armillary Sphere LLC and are protected by copyright, trademark, and other intellectual property laws.
Your License
We grant you a limited, non-exclusive, non-transferable, revocable license to:
- Access and use the Website for personal, non-commercial purposes
- Print puzzles for your personal use
You may not reproduce, distribute, modify, create derivative works, publicly display, or commercially exploit any content from Sudoku Web without our prior written consent.
5. User-Generated Content
Currently, Sudoku Web does not allow users to submit or post content (such as comments or user profiles). All game data is stored locally on your device.
If we introduce user-generated content features in the future, we will update these Terms accordingly.
6. Privacy and Data
Your privacy is important to us. Please review our Privacy Policy to understand how we handle data.
Key points:
- We do not collect personal information
- All game data is stored locally on your device
- We do not track, sell, or share your data
7. Disclaimer of Warranties
Sudoku Web is provided on an "AS IS" and "AS AVAILABLE" basis. We make no warranties or representations, express or implied, including but not limited to:
- The Website will be uninterrupted, secure, or error-free
- The results obtained from using the Website will be accurate or reliable
- Any defects or errors will be corrected
To the fullest extent permitted by law, we disclaim all warranties, including warranties of merchantability, fitness for a particular purpose, and non-infringement.
8. Limitation of Liability
To the maximum extent permitted by law, Armillary Sphere LLC shall not be liable for any indirect, incidental, special, consequential, or punitive damages, including but not limited to:
- Loss of data or game progress
- Loss of profits or revenue
- Loss of use or enjoyment
- Costs of substitute services
This limitation applies whether the claim is based on contract, tort, negligence, strict liability, or any other legal theory, even if we have been advised of the possibility of such damages.
Some jurisdictions do not allow the exclusion of certain warranties or the limitation of liability for incidental or consequential damages. In such jurisdictions, our liability will be limited to the greatest extent permitted by law.
9. Indemnification
You agree to indemnify, defend, and hold harmless Armillary Sphere LLC from any claims, liabilities, damages, losses, costs, or expenses (including reasonable attorneys' fees) arising from:
- Your use or misuse of the Website
- Your violation of these Terms
- Your violation of any third-party rights, including intellectual property rights
10. Third-Party Links
Sudoku Web may contain links to third-party websites (such as our blog or contact platforms). We are not responsible for:
- The content, accuracy, or opinions expressed on third-party sites
- Privacy practices of third-party sites
- Any damages or losses caused by third-party sites
Your use of third-party websites is at your own risk and subject to their terms and conditions.
11. Modifications to the Service
We reserve the right to:
- Modify or discontinue any feature, temporarily or permanently
- Change these Terms at any time
- Restrict access to certain features or the entire Website
We will notify users of significant changes by posting an updated "Last Updated" date on this page. Continued use of the Website after changes constitutes acceptance of the new Terms.
12. Termination
We reserve the right to:
- Terminate or suspend your access to the Website at any time, for any reason, without notice
- Delete any locally stored data if technically necessary (though we cannot access it directly)
Upon termination, your right to use the Website will immediately cease. Sections of these Terms that by their nature should survive termination (such as disclaimers, limitations of liability, and indemnification) will remain in effect.
13. Governing Law and Dispute Resolution
Governing Law
These Terms are governed by and construed in accordance with the laws of the United States, without regard to conflict of law principles.
Dispute Resolution
If you have a dispute with Sudoku Web, please contact us first at our email to attempt informal resolution.
If informal resolution is not successful, any legal action or proceeding arising out of these Terms shall be brought exclusively in the courts located in the United States, and you consent to the jurisdiction of such courts.
14. Miscellaneous
Entire Agreement
These Terms, together with our Privacy Policy, constitute the entire agreement between you and Sudoku Web regarding your use of the Website.
Severability
If any provision of these Terms is found to be invalid or unenforceable, the remaining provisions will remain in full force and effect.
Waiver
Our failure to enforce any right or provision of these Terms will not be deemed a waiver of such right or provision.
Assignment
You may not assign or transfer these Terms or your rights under them without our prior written consent. We may assign these Terms at any time without restriction.
15. Contact Information
If you have questions, concerns, or feedback about these Terms, please contact us:
Email: Contact Us
Website: sudoku-web.com
Acknowledgment
By using Sudoku Web, you acknowledge that you have read, understood, and agree to be bound by these Terms of Service.
Thank you for playing responsibly and enjoying Sudoku Web!