Sudoku
Play Sudoku online or generate printable PDF puzzles
Experience the classic number puzzle game with our feature-rich Sudoku application. Play interactively online with helpful features like notes, error checking, and hints, or generate printable PDF puzzles in various layouts. Perfect for brain training, relaxation, and improving logical thinking skills.
Notes allow you to mark possible numbers (candidates) in empty cells. This helps you keep track and draw logical conclusions.
How it works:
- Click the "Notes" button above to activate notes mode
- Select an empty cell in the Sudoku grid
- Click on numbers (1-9) to add them as small candidate notes
- Click on a number again to remove it from the notes
💡 Tip: When you set a final number (notes mode off), all notes in that cell are automatically removed.
Statistics
Best Time
How to Sudoku
Choose Difficulty
Select from Easy, Medium, Hard, or Expert based on your skill level.
Fill the Grid
Click cells and enter numbers 1-9. Each row, column, and 3x3 box must contain all digits.
Use Helpers
Enable notes mode for candidates, use hints when stuck, or undo mistakes.
Complete or Print
Solve the puzzle online or switch to Print tab to generate PDF puzzles.
Features
- 4 difficulty levels (Easy, Medium, Hard, Expert)
- Interactive online gameplay
- Notes/candidates mode for advanced solving
- Undo/Redo functionality
- Timer with pause feature
- Error highlighting (optional)
- Keyboard navigation support
- PDF export with multiple layouts
- Batch puzzle generation
- Statistics tracking
Why Use This Tool?
- Train your brain with logical puzzles
- Play anywhere without internet (print PDFs)
- Track your progress with statistics
- Multiple difficulty levels for all skill levels
- No registration required
- 100% free and unlimited
- Works on desktop and mobile
- Generate puzzles for classrooms or events