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Hard sudoku puzzles printable

8 free printable hard sudoku puzzles. Each has exactly one solution; solutions are on the last pages.

Hard puzzles start with about 27 of the 81 numbers, so expect to write small candidate digits in the corners of squares and look for pairs that rule out other squares. Every puzzle still has exactly one solution.

Solutions

✓ Checked: every puzzle on this page has exactly one solution.

Make more hard sudoku

• Easy
• Medium
• Hard
• Large print
• 6×6 for kids