Pure Sudoku
CLEAN. SMART. ADDICTIVE.
Hard Sudoku printable
Print a hard Sudoku puzzle with answers.
Generate a tough Sudoku worksheet for experienced solvers. The printable opens with a clean puzzle page and a matching answer key.
- Difficulty
- Hard by default
- Includes
- Answer key
- Best for
- Advanced paper practice
Print now
Generate a hard Sudoku PDF with an answer key.
Hard is selected by default. Switch to Expert if you want the toughest worksheet.
The answer key appears on page two.
When to use hard printables
Hard worksheets slow the solve down in a useful way.
Printed hard Sudoku is best for deliberate practice: no notifications, no autofill, and enough resistance to make candidate discipline matter.
- Use pencil marks for candidate-heavy boxes.
- Check the answer key only after a full logical pass.
- Move to the online Hard board when you want timing and retries.
Prefer a timer?
Play Hard Sudoku online after the worksheet.
The online board gives you notes, timing, and another fresh challenge when the printable is done.