Printable Hard Sudoku — Free PDF
Download 50 free printable hard sudoku puzzles as PDF, organized into 5 packs of 10. Hard printable sudoku puzzles demand intermediate techniques and disciplined pencil marks. Expect to use naked pairs, pointing pairs, and box-line reduction. Every pack is US Letter size with one large puzzle per page — no registration, no email.
- Vol. 1 Puzzles #1–10Download PDF ↓
- Vol. 2 Puzzles #11–20Download PDF ↓
- Vol. 3 Puzzles #21–30Download PDF ↓
- Vol. 4 Puzzles #31–40Download PDF ↓
- Vol. 5 Puzzles #41–50Download PDF ↓
"Very little is needed to make a happy life; it is all within yourself, in your way of thinking." — Marcus Aurelius
"Very little is needed to make a happy life; it is all within yourself, in your way of thinking." — Marcus Aurelius
Solving Hard Sudoku on Paper
Hard printable sudoku puzzles demand intermediate techniques and disciplined pencil marks. Expect to use naked pairs, pointing pairs, and box-line reduction.
Bring a pencil and an eraser — pencil marks are the key to every intermediate and advanced technique. When you finish a pack, move up a level or check your solving speed online.