🔷 Sudoku
N = pencil · F = fullscreen
Click a cell, then press a number or use the pad · N = pencil notes
📖 How to Play Sudoku tap to expand
Goal: Fill the 9×9 grid so every row, column, and 3×3 box contains digits 1–9 exactly once.
Controls: Click a cell to select it, then tap a number on the pad or press keyboard 1–9. Delete/Backspace to erase.
✏️ Pencil mode (N key): enter small candidate notes instead of confirmed answers.
✓ Check: highlights incorrect cells in red.
3 mistakes = game over. 🌱 Easy has more given numbers; 🔥 Hard requires advanced deduction.
🎯 Tips & Strategy — Sudoku
- Start with cells that have only one possible number — called "naked singles."
- Use pencil marks to track candidate numbers in cells you're unsure about.
- Look for naked singles first, then hidden singles before trying harder techniques.
- Check rows, columns, and 3×3 boxes simultaneously to spot constraints faster.
- Never guess — every valid Sudoku puzzle has a logical solution.
❓ Frequently Asked Questions
Is Sudoku free to play?
Yes — completely free, no download, no login needed. Play directly in your browser.
What difficulty levels are available?
Easy, Medium, Hard, and Expert — each with a different number of given clues and required solving techniques.
Can I use hints?
Yes — a hint button is available to reveal a cell when you get stuck.
Does it check my solution?
Yes — the puzzle auto-checks when complete and highlights any incorrect cells in red.
🎮 About Sudoku Unblocked
Sudoku is a logic-based number puzzle played on a 9×9 grid. Fill every row, column, and 3×3 box with the digits 1–9 without repeating any number. No math required — just pure logic and deduction. This free unblocked version includes multiple difficulty levels, pencil notes, timer, and hint support — works at school, no download needed.