Free Printable Hard Sudoku
Fewer givens and trickier deductions — expect hidden pairs, pointing pairs and patient candidate work. A satisfying test that still needs no guessing.
Four hard grids per A4 page (around 26–29 given numbers), with an optional answer key — experienced solvers who like to earn the finish.
A sample hard grid — your PDF gives fresh puzzles each time.
How to print your hard Sudoku
- Click Generate free PDF — the Hard difficulty is already selected.
- Optionally tick Include solution page to add an answer key.
- Your browser opens a print-ready A4 PDF with four puzzles. Print it, or save it for later.
- Grab a pencil — every puzzle is solvable by pure logic, no guessing.
More printable Sudoku
Printable Hard Sudoku — FAQ
Are these printable hard Sudoku puzzles free?
Yes — the PDF generator is completely free, with no account and no watermark. Print as many hard puzzles as you like.
How many puzzles fit on a page?
Four Classic Sudoku grids per A4 page, sized for comfortable pen-and-paper solving. You can also add a matching answer key.
Do the printed puzzles have a unique solution?
Every puzzle is generated with exactly one solution reachable by logic alone — you never have to guess, on screen or on paper.
Can I get the solutions too?
Yes. Tick “Include solution page” in the generator and the PDF adds an answer key after the puzzles.