Printable Hard Sudoku

Set ohpzvh. 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
6 9 2 4
2
5 1 8
7 8 9
3 9 1 7
6 2 3
7 1 4 9 6
5
4 7 9 6 2
Hard #2
2 4
6 1
3 1 2 9
2 1 6 5 3 8
6 9 2
7 3 2 6
4 5 7
2 3 6
4 8
Hard #3
4 6 2 7
1 6
2 3 5 8 4
2 1 4
5 3 2
1 9 3
9 2 8
6 4
8 4 6 9
Hard #4
7 8 4
9 1 7
5 3
6 3
2 3 4 8
4 9 2 1 5
8 9 3
7 2 9 5
1 4 7
Hard #5
6 8 5 9 7 3 2
5
1 2
4 5 1 7 8
1 7
8 7 5 3
6 2
3 5 4
9 4 8
Hard #6
9
3 2 7 4
1 5 6 9 7 2
2 4 5
6 8 5
7 1
2 6 7 3
2 7 4
3 7 5
Hard #7
4 1 2 8 7
8 5
2 4 9
5 4 2 9
1 2 7 8
6 1 2 3
6
7 6
3 5 9 4
Hard #8
2 6 1 5 7
8 2 7
1
6 7 2
9 2 1 3
6 4 9
5 1 2 4
4 9 6 2
2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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