Sudoku365 - Daily Sudoku Puzzles, Printable PDFs & Free Online Games

Today's Sudoku Challenge - January 27, 2026

Start your day with a fresh Sudoku puzzle. Choose your difficulty level and play instantly in your browser.

Easy Sudoku

Perfect for beginners and relaxing morning coffee. 38-40 given numbers.

Play Today's Easy Puzzle →

Medium Sudoku

A balanced challenge for regular solvers. Requires basic techniques. 33-35 clues.

Play Today's Medium Puzzle →

Hard Sudoku

For experienced players. Advanced strategies needed. 29-31 starting numbers.

Play Today's Hard Puzzle →

Expert Sudoku

The ultimate test. Master-level techniques required. Only 25-27 clues.

Play Today's Expert Puzzle →

Why Choose Sudoku365?

⚡ Instant Loading

Pre-rendered puzzles load in milliseconds. No heavy frameworks, no loading spinners. Just pure, fast Sudoku.

📅 Complete Daily Archive

Access every puzzle from 2026. Missed yesterday? Go back and play any date. Build your solving streak.

🖨️ Printable PDFs

Download high-quality PDF puzzles for offline solving. Perfect for travel, teaching, or paper-and-pencil solving.

🎓 Learn Advanced Techniques

Master strategies like X-Wing, Swordfish, and Y-Wing with our comprehensive tutorial section.

🌙 Dark Mode

Solve comfortably at night with our eye-friendly dark mode. Automatically saves your preference.

⌨️ Keyboard Support

Full keyboard navigation with arrow keys and number input. Optimized for speed solving.

What is Sudoku?

Sudoku is a logic-based number puzzle game that originated in Japan. The goal is to fill a 9x9 grid with digits from 1 to 9, following three simple rules:

Each row must contain all digits from 1 to 9 without repetition
Each column must contain all digits from 1 to 9 without repetition
Each 3x3 box (there are 9 boxes total) must contain all digits from 1 to 9 without repetition

The puzzle starts with some numbers already filled in (called "givens" or "clues"). Your task is to use logic and deduction to fill in the remaining cells. A well-designed Sudoku puzzle has exactly one unique solution.

Benefits of Playing Sudoku

Improves concentration and focus: Sudoku requires sustained attention to detail and pattern recognition
Enhances logical thinking: Regular practice strengthens deductive reasoning skills
Provides stress relief: The meditative quality of solving puzzles helps reduce anxiety
Boosts memory: Remembering number patterns and strategies exercises your working memory
Accessible for all ages: From children to seniors, Sudoku offers mental stimulation at any difficulty level

How to Play Sudoku Online

Playing Sudoku on Sudoku365 is simple and intuitive:

Select a puzzle: Choose from Easy, Medium, Hard, or Expert difficulty
Click a cell: Click any empty cell to select it (given numbers cannot be changed)
Enter a number: Click a number button below the grid or press 1-9 on your keyboard
Navigate with arrows: Use arrow keys to move between cells quickly
Use hints sparingly: Click the Hint button if you're stuck (it reveals the correct number for the selected cell)
Check your work: Use the Check button to highlight any mistakes
Complete the puzzle: Fill all cells correctly to finish. Your time will be recorded!

Game Modes

Paper Mode: No automatic error checking. Solve like you would on paper
Auto-Check Mode: Mistakes are highlighted immediately in red

Popular Sudoku Categories

Daily Sudoku by Date

Browse our complete archive of daily puzzles. Every day in 2026 has four difficulty levels.

View Daily Archive →

Printable Sudoku PDFs

Download PDFs with 4, 6, or 12 puzzles per page. Includes solutions. Perfect for classrooms and travel.

Download Printables →

Sudoku Strategy Guides

Learn techniques from basic to advanced: Hidden Singles, Naked Pairs, X-Wing, Swordfish, and more.

Learn Techniques →

Sudoku Variants

Try Killer Sudoku, Samurai Sudoku, 16x16 Sudoku, and Mini 4x4 puzzles for kids.

Explore Variants →

Recent Daily Sudoku Puzzles

Catch up on puzzles from the past week. Each day features four difficulty levels to match your skill.

Frequently Asked Questions

Is Sudoku365 completely free?

Yes, all puzzles on Sudoku365 are completely free to play online. You can also download printable PDFs at no cost.

Do I need to create an account?

No account required. Just visit any puzzle page and start playing immediately. Your progress is saved automatically in your browser.

How many puzzles are available?

We have 1,460 unique puzzles for 2026 (365 days × 4 difficulty levels). Each puzzle is hand-crafted with a guaranteed unique solution.

Can I play Sudoku offline?

Yes, download our printable PDF collections. Each PDF includes multiple puzzles with solutions on separate pages.

What makes a good Sudoku puzzle?

A quality Sudoku puzzle has exactly one unique solution and can be solved using logical deduction alone, without guessing. All our puzzles meet these criteria.

What's the difference between difficulty levels?

Easy: 38-40 clues, solvable with basic scanning techniques
Medium: 33-35 clues, requires Hidden Singles and Naked Pairs
Hard: 29-31 clues, needs advanced patterns like Locked Candidates
Expert: 25-27 clues, demands master techniques like X-Wing and Swordfish

How do I improve at Sudoku?

Start with easy puzzles to build confidence. Learn basic techniques in our Strategy section. Practice daily to recognize patterns faster. Gradually increase difficulty as you improve.

Play Sudoku

Time: 00:00

Difficulty: Easy

Mistakes: 0

Seed:

How to Play Sudoku

Sudoku is a classic number puzzle game that challenges your logical thinking. The goal is simple: fill a 9×9 grid with numbers so that each row, column, and 3×3 box contains all digits from 1 to 9. When you play Sudoku online at Sudoku 365, you can enjoy free Sudoku puzzles every day with varying difficulty levels.

Start with the easy Sudoku puzzles to learn the basics, then progress to medium and hard Sudoku challenges. Our daily Sudoku feature provides a new puzzle every day that's the same for all players worldwide. Use the Notes feature to mark possible numbers in cells, helping you solve Sudoku puzzles more efficiently.

Keyboard Shortcuts

1-9 - Enter number
Arrow Keys - Navigate grid
Backspace/Delete - Clear cell
Enter - Toggle Notes mode
H - Get hint
N - New game
U/R - Undo/Redo

About Sudoku 365

Welcome to Sudoku 365, your destination for free online Sudoku puzzles. Our mission is to provide a clean, accessible, and enjoyable Sudoku experience for players of all skill levels.

We believe that great puzzle games should be simple, elegant, and available to everyone. That's why Sudoku 365 features a minimalist design that puts the focus on what matters most: the puzzle itself. No distractions, no advertisements, just pure Sudoku enjoyment.

Every day brings a new daily Sudoku challenge, carefully crafted to provide the perfect balance of difficulty and satisfaction. Whether you're a beginner looking to learn or an expert seeking a challenge, Sudoku 365 has something for you.

Features

Three difficulty levels: Easy, Medium, and Hard
Daily puzzles that sync across all devices
Full keyboard and touch support
Notes mode for tracking possibilities
Hint system to help when you're stuck
Clean, dark theme that's easy on the eyes
No ads, no tracking, no distractions

Contact Us

We'd love to hear from you! Whether you have feedback, suggestions, or just want to say hello, feel free to reach out.

Your privacy is important to us. This form doesn't actually submit data anywhere - it's just for demonstration purposes. No personal information is stored on our servers.

Alternatively, you can reach us directly at:

hello@sudoku365.com

Daily Sudoku Puzzles for 2026