Play Sudoku Classic online now to solve clean 9x9 puzzles in your browser. This free HTML5 game offers easy controls, multiple difficulties and helpful tools so you can start a new puzzle in seconds.
Perfect for casual players and learners, Sudoku Classic trains logic and attention. Tap or click cells, add pencil marks, and use hints to finish puzzles faster while tracking your time and progress.
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Desktop
- Click a cell to select it with the mouse.
- Press keys 1-9 to enter a digit into the selected cell.
- Use arrow keys to move selection between cells.
- Press Backspace or Delete to clear a cell.
- Click on-screen buttons for Pencil/Notes, Hint, Undo, New Puzzle, and Pause.
Mobile
- Tap a cell to select it.
- Tap a number on the on-screen number panel to place that digit.
- Tap the Pencil or Notes icon to toggle pencil mode for candidate numbers.
- Use Hint and Undo buttons on the screen to get help or revert moves.
- Use device back or close to pause; the game is responsive and fits mobile screens.
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Sudoku Classic is a faithful online version of the popular logic puzzle played on a 9 x 9 grid. The grid divides into nine 3 x 3 squares. Your goal is to place the numbers 1 through 9 so that each number appears exactly once in every row, every column and every 3 x 3 square. The challenge is logic based. No math beyond simple number recognition is required.
The game offers a simple, clear interface that focuses on solving. Select any empty cell and enter a digit. Use pencil marks or notes to track candidate numbers while you reason through the puzzle. Built-in tools such as hints, error checking and an undo function help new players learn and let experienced players refine their technique. Timed sessions and difficulty settings from easy to hard make this game suitable for casual play, daily practice and improving concentration and pattern recognition.
- Classic 9x9 Sudoku rules and layout.
- Intuitive input for numbers and pencil marks.
- Hint and error-check options to assist learning.
- Timer and simple stats to track your progress.
- Responsive HTML5 design for desktop and mobile play.
Whether you want a quick brain warm up or a longer logic session, Sudoku Classic gives a clean environment to focus on strategy and solve puzzles at your own pace.
Game Details
Category
Puzzle
Developer
Lofgames
Technology
HTML5
Platform
Web Browser
Devices
Desktop, Tablet, Mobile
Game Features
Classic 9x9 Grid
Play the standard 9 x 9 Sudoku layout that follows the traditional rules for rows, columns and 3 x 3 squares.
Multiple Difficulty Levels
Choose from easy, medium and hard puzzles to match skill and improve gradually.
Pencil Marks and Notes
Add candidate numbers as pencil marks to plan moves and solve logically step by step.
Hints and Error Check
Use hints to reveal a safe move and an error check to spot incorrect entries while learning strategies.
Timer and Simple Stats
Track completion time and basic stats to measure improvement over multiple games.
Responsive HTML5 Interface
Play on desktop or mobile with a clean, touch-friendly layout and quick controls.
Frequently Asked Questions
Select an empty cell and enter a number from 1 to 9 so each row, column and 3 x 3 square contains each number exactly once. Use logic and pencil marks to eliminate possibilities.
Yes. The game uses a responsive HTML5 interface. Tap cells and use the on-screen number panel and controls to play on mobile devices.
Pencil marks let you write small candidate numbers inside a cell. Use them to track possible values while you deduce the correct number.
Yes. Use the Hint button to reveal a safe move and the error check feature to find incorrect entries. These tools help you learn and avoid mistakes.
Save behavior varies by site. If a save option exists, use the on-screen save or account features. Otherwise complete the puzzle in one browser session or keep the tab open to resume.