Printable Hard Sudoku

Set oya37z. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
5 3 8 7
7 1 6 2
1 2 6 8 9
6 9 1
9 3
6 3 9 5
9 4 2
2 6 7 4
Hard #2
5 3 9
8 1 2
4 6 5
1 9 8 5
8 2 1
3 9
9 6 8 4 2
2 9 5
4 8 3
Hard #3
3 4
6 3 2
8 2 7 6
6 4 3 7
7 5 9 1
4 9 5 8 2
9 1 7 6
2 3 9
Hard #4
8 2
6 5 9 4
8 7 3
3 2 8 6 7 9
4 5 8
5 7 3 8
7 1 6 4
2 7 5
Hard #5
7 1
6 3 8 7 1
8 2 4 3
9 5 4 6
5 3 2 1
8 5
1 5 2
9
8 9 3 4
Hard #6
2 6 5 4 8
8 3
1 9 3 6 7
4 8
6
7 2 6
3 2 6 8 5
1 6 7 4
8 9
Hard #7
9 7 8
1 7 8 6
3 2 9
5 7 1
2 6 5 3
4 2 7 9
3
5 6 8
3 1 5 9
Hard #8
6 1 4
7 3 2 9 5
9 3 8
6 7 5
8
5 1 6 8
3
1 9 8 5 3 2
8 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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