Play Classic Sudoku Puzzle online now to sharpen your logic and have fun solving 9x9 number grids. Choose beginner, intermediate, or expert puzzles and play with or without a timer.
Tap or click to place numbers, use notes for candidates, and rely on hints when you get stuck. This responsive Sudoku game works on desktop, Apple and Android devices for quick brain training anytime.
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Desktop
- Click a cell to select it.
- Press number keys 1-9 to enter a value into the selected cell.
- Use arrow keys to move the selection between cells.
- Press Backspace or Delete to clear a cell.
- Press N or click the Notes button to toggle pencil mode for candidate numbers.
- Use Undo, Hint, Restart from the on-screen controls.
Mobile
- Tap a cell to select it.
- Tap a number button (1-9) to place that number.
- Long press a number or use the Notes toggle to add or remove pencil marks.
- Tap Undo to revert the last move and Hint to reveal a correct number.
- Use the menu to restart, switch difficulty, or toggle the timer.
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Classic Sudoku Puzzle is a single player logic game based on the classic 9x9 grid. Fill every row, column, and 3x3 box with numbers 1 to 9 so that no number repeats. The game delivers clean rules and steady challenge for beginners and advanced solvers alike.
Play in timed mode to test speed or in relaxed mode to focus on strategy. Use pencil notes to mark candidate numbers, get optional hints, undo moves, and highlight mistakes. The interface adapts to desktop and mobile screens so you can play on any device. Each puzzle is designed to exercise pattern recognition, logic and concentration while tracking your best times and completion stats.
Game Details
Category
Puzzle
Developer
Unknown
Technology
HTML5
Platform
Web Browser
Devices
Desktop, Tablet, Mobile
Game Features
Classic 9x9 Grid
Solve standard 9x9 Sudoku puzzles that follow the original rules for pure logic play.
Multiple Difficulty Levels
Choose from Beginner, Intermediate, and Expert puzzles to match your skill and progress.
Timed and Relaxed Modes
Play timed challenges to improve speed or use relaxed mode to focus on strategy without pressure.
Pencil Notes and Hints
Use notes to mark candidate numbers and request hints when you need a nudge to continue.
Responsive Mobile Play
Fully playable on phones and tablets with touch controls for on-the-go brain training.
Undo and Error Highlight
Undo moves and highlight mistakes to learn from errors and improve solving techniques.
Frequently Asked Questions
Complete the 9x9 grid so each row, column, and 3x3 box contains the numbers 1 to 9 with no repeats. The puzzle is solved when all cells are filled correctly.
Yes. The game uses a responsive interface that works on Apple and Android devices. Tap cells and numbers to play on mobile.
Yes. You can select Beginner, Intermediate, or Expert puzzles to match your experience and challenge level.
Pencil notes let you add candidate numbers to a cell. Toggle Notes, then tap or press a number to add or remove candidates while you work.
The game offers timed challenges and a relaxed untimed mode. You can toggle the timer in the game menu before or during play.