Hard Sudoku (★★★★): 10 Large Print Puzzles
Hard puzzles use pairs. Suppose two empty squares in the same row can each hold only a 3 or an 8. Between them, they must take the 3 and the 8, one each. So no other square in that row can be a 3 or an 8, and you can cross those numbers off the rest of the row. Pairs work the same way in a column or a 3×3 box. Small pencil notes in the corners of the squares make pairs much easier to spot.
Open a PDF and print it on A4 or US Letter paper. Page 1 is the puzzle. Page 2 has the hint and the answer.
- Hard puzzle 1 (PDF, 2 pages)
- Hard puzzle 2 (PDF, 2 pages)
- Hard puzzle 3 (PDF, 2 pages)
- Hard puzzle 4 (PDF, 2 pages)
- Hard puzzle 5 (PDF, 2 pages)
- Hard puzzle 6 (PDF, 2 pages)
- Hard puzzle 7 (PDF, 2 pages)
- Hard puzzle 8 (PDF, 2 pages)
- Hard puzzle 9 (PDF, 2 pages)
- Hard puzzle 10 (PDF, 2 pages)
Other levels: Beginner / Easy / Medium. Step-by-step help: How to Solve Sudoku.









