📖 How to Play & Rules – Sudoku
- Sudoku is played on a 9×9 grid divided into nine 3×3 sub-boxes.
- Fill every empty cell with a digit from 1 to 9 so that each row, each column, and each 3×3 box contains all digits from 1 to 9 without repetition.
- Pre-filled starting digits cannot be modified.
- Toggle Notes Mode (✏️ Pencil) to jot down candidate numbers inside cells.
💡 Strategy Tips & Tricks
- Cross-Hatching: Pick a digit that already appears many times on the board and trace its rows and columns into remaining 3×3 boxes to spot forced placements.
- Keep Pencil Notes Clean: Whenever you place a final digit, our board automatically clears that candidate from peers in the same row, column, and 3×3 box.
Free & 100% Local In-Browser Gameplay
This game runs 100% locally in your browser with zero server latency. No download, no account registration, and no app store installs required—fully optimized for mobile, tablet, and desktop with touch and keyboard controls.
❓ Frequently Asked Questions (FAQ)
Are the Sudoku puzzles generated locally?
Yes! Every puzzle is freshly generated right in your browser with a guaranteed valid solution across Easy, Medium, and Hard modes.