Sudoku Online – Play Free Online
Sudoku Online brings you unlimited free number puzzles. Choose your difficulty, sharpen your logic, and challenge yourself with a fresh 9×9 grid every day — play free in your browser, no download needed!
▸ How to Play Sudoku Online
- Pick a difficulty level — a fresh 9×9 puzzle grid loads with some numbers filled in as clues.
- Click an empty cell and place a digit from 1 to 9 — each number can appear only once per row, column, and 3×3 box.
- Use pure logic to deduce the remaining numbers — scan rows, columns, and boxes to narrow down the candidates.
- Made a mistake? Simply clear the cell and try again — no penalty, play at your own pace.
- Fill the whole grid so every row, column, and 3×3 box contains digits 1 through 9 — then enjoy your victory!
✦ Why Players Love Sudoku Online
Unlimited Puzzles
A fresh 9×9 grid every day with multiple difficulty levels — from gentle warm-ups to fiendish challenges.
Train Your Logic
Every sudoku is a pure logic challenge — no guessing, just clean deduction that sharpens your mind.
Play Anywhere
Runs in your browser on desktop, tablet, and mobile. Your daily puzzle is always in your pocket.
Dark & Light Themes
Switch between a sleek dark mode for late-night solving and a bright light mode for daytime sessions.
Instant Play
No download, no sign-up, no subscription — open the page and start solving in seconds.
Beat Your Best
Level up gradually: as you get faster, take on harder grids and watch your solving skills soar.
❓ Frequently Asked Questions
What is Sudoku Online?
Sudoku Online is a free browser-based number puzzle where you fill a 9×9 grid with digits 1 through 9 — each row, column, and 3×3 box must contain every digit exactly once. The classic logic puzzle, playable instantly on any device.
How do you play sudoku?
Pick a difficulty and fill the empty cells with digits 1–9. Each digit may appear only once in every row, column, and 3×3 box. Use logic — not guessing — until the grid is complete.
Is Sudoku Online completely free?
Yes! All puzzles on sudoku-online.cn are 100% free with no hidden costs, no subscription, and no account registration.
What difficulty levels are available?
Multiple tiers — from easy grids with plenty of pre-filled clues up to expert puzzles with minimal starting numbers. Work your way up as your technique improves.
Do I need to download or install anything?
No. Sudoku Online runs entirely in your web browser and works on desktop, tablet, and mobile alike.
Can I play on my phone or tablet?
Yes, the game is fully responsive. Open the site in your mobile browser and play with taps — the layout adapts automatically.