Play Free Sudoku Online

What is Sudoku?

Sudoku is the world's most popular number puzzle. The goal is simple: fill a 9×9 grid so that every row, column, and 3×3 box contains the digits 1 through 9 exactly once. No math is required — just logic, patience, and pattern recognition. Whether you are a complete beginner or an experienced solver, Sudoku offers a satisfying mental challenge that sharpens your concentration and problem-solving skills.

Why Play on Sudoku247?

Sudoku247 is a modern, ad-free Sudoku platform built for players who want a clean, distraction-free experience. Unlike other Sudoku sites cluttered with ads and pop-ups, every feature here is completely free with no registration required. Our puzzles are generated instantly on your device, so you never run out of fresh challenges.

• AI-Powered Hints — Stuck on a tough puzzle? Our intelligent hint system analyzes the board and guides you step by step, explaining which technique to use and why. Learn as you play.
• Photo Upload Solver — Snap a photo of any Sudoku puzzle from a newspaper, book, or magazine. Our OCR technology reads the grid and lets you solve it digitally or get the solution instantly.
• Four Difficulty Levels — Choose from Easy, Medium, Hard, or Expert puzzles. Each level is carefully calibrated to match your skill, and you can progress through them as you improve.
• Comprehensive Technique Library — Learn over 10 solving techniques, from basic Naked Singles to advanced strategies like X-Wing, Y-Wing, and Swordfish. Each technique includes interactive examples and step-by-step explanations.
• No Ads, Ever — Enjoy a clean, modern interface with zero advertisements. Just you and the puzzle.

How to Get Started

New to Sudoku? Start with an easy puzzle and use the hint button whenever you get stuck. The hint system will teach you fundamental techniques like Last Free Cell and Naked Singles. As you build confidence, move up to medium and hard puzzles that require more advanced strategies. For a complete overview of the rules, visit our how to play Sudoku guide. Check out our Sudoku tips for strategies at every level. For a fresh challenge every day, try the daily sudoku puzzle — the same puzzle for every player worldwide.