How do I play Sudoku?

Fill in the 9x9 grid so that each row, column, and 3x3 box contains the digits 1-9 exactly once. Click a cell to select it, then click a number or press 1-9 on your keyboard. Use pencil mode to mark possible candidates.

What are the difficulty levels?

Easy puzzles have 36-45 given numbers and can be solved with basic techniques. Medium has 32-35 clues. Hard has 28-31 clues. Expert has 24-27 clues. Evil puzzles have only 17-23 clues and require advanced strategies.

How does the timer work?

The timer starts automatically when you enter your first number into any cell. This lets you examine the puzzle before starting the clock. Your completion time is recorded in your statistics.

Can I print Sudoku puzzles?

Yes! You can print the current puzzle using your browser's print function or generate high-quality PDF printables from our puzzle archive pages.

Daily Hard Sudoku

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🎯 Goal

Fill the 9×9 grid so that each row, column, and 3×3 box contains the digits 1-9 exactly once.

🎮 Controls

Click a cell to select it
Click a number (1-9) or press the keyboard number to enter it
Arrow keys navigate between cells
Delete/Backspace clears the selected cell
P key toggles pencil mode
Ctrl+Z to undo, Ctrl+Y to redo

✏️ Pencil Mode

Use pencil mode to mark candidate numbers in empty cells. This helps you track which numbers are still possible for each cell.

⏱️ Timer

The timer starts when you enter your first number. This gives you time to examine the puzzle before the clock begins.

📊 Difficulty Levels

Level	Given Numbers	Description
Easy	36-45	Basic techniques only
Medium	32-35	Some intermediate strategies
Hard	28-31	Advanced techniques required
Expert	24-27	Complex solving patterns
Evil	17-23	Maximum challenge!

💡 Tips

Start with cells that have fewer candidates
Look for "naked singles" (cells with only one possibility)
Use pencil marks to track candidates systematically
Check rows, columns, and boxes for "hidden singles"