Play Sudoku-ClassicSudokuPuzzle online now and solve more than 1,200 classic Sudoku puzzles. Choose from Simple, Medium, Hard, and Expert levels to match your skill.
Use pencil mode to add notes, smart tips when you need help, and dark theme to protect your eyes. Start a game and enjoy clear controls, helpful hints, and steady logic-based challenge.
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Desktop
- Click a cell to select it.
- Press number keys 1-9 or use the numpad to enter digits.
- Press Delete or Backspace to clear a cell.
- Use the on-screen pencil icon to toggle notes (pencil mode).
- Click the Hint button to get a smart tip; use Ctrl+Z or the Undo button to undo your last move.
Mobile
- Tap a cell to select it.
- Use the on-screen number keypad to enter digits 1-9.
- Tap the pencil icon to toggle notes (pencil mode).
- Tap the hint button for a smart tip.
- Use the erase or long press to clear a cell.
- Tap the undo button to revert the last move.
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Sudoku-ClassicSudokuPuzzle is a clean and focused online Sudoku game that challenges your logic and pattern skills. The goal is simple: place digits 1 to 9 so each row, column, and 3x3 block contains every number exactly once. This game offers more than 1,200 puzzles across four difficulty levels to suit beginners and advanced players.
Gameplay is clear and user friendly. Use pencil mode to add notes when you are unsure, or turn it off to place final answers. The built-in highlight feature warns you of repeated numbers in any row, column, or block. Smart tips guide you when you get stuck, and an undo option lets you revert your last move. Choose a visual theme or enable dark mode to reduce eye strain. The game focuses on pure logic with steady progression through increasing challenge levels.
Play short puzzles for quick practice or tackle harder grids to improve pattern recognition and deduction speed. Sudoku-ClassicSudokuPuzzle is suitable for all ages and works well as a daily brain training exercise or a relaxed time filler.
Game Details
Category
Puzzle
Developer
Unknown
Technology
HTML5
Platform
Web Browser
Devices
Desktop, Tablet, Mobile
Game Features
Large Puzzle Bank
Over 1,200 hand-picked puzzles to keep you challenged for hours.
Four Difficulty Levels
Simple, Medium, Hard, and Expert levels suit beginners and advanced solvers.
Pencil Mode for Notes
Add candidate numbers in any cell to plan moves and track possibilities.
Smart Tips and Highlights
Get guided hints and automatic repetition highlights to avoid mistakes.
Undo and Easy Controls
One-step undo and clear controls help you correct errors quickly.
Themes and Dark Mode
Choose a visual theme or enable dark mode to reduce eye strain during long play.
Frequently Asked Questions
Select a puzzle, then place digits 1 to 9 so each row, column, and 3x3 block contains every number once. Use pencil mode for notes and hints if needed.
Pencil mode lets you add small candidate numbers in a cell. Use it to track possible values before you decide on a final number.
Click or tap the Hint button to receive a smart tip that guides you toward a logical move without giving away the whole solution.
Yes. Choose Simple, Medium, Hard, or Expert before you start a puzzle to match the challenge to your skill level.
Most online sessions keep your current puzzle active in your browser. Use the undo and continue features to return to your game if you reopen the page. Save behavior depends on your browser settings.