Printable Hard Sudoku

Set 9v9fax. 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
3 1
7 8 3 4
9 6 2 1
3 2 7 8 9
5
5 8 1
2 4 5
7 8 3 9 1 2
7
Hard #2
9 8 4 2
1 4
2 8 3 7
4 6 3 9
6 7 2
1 3
6 8 4
3 9 2
4 1 2 5
Hard #3
6 4 2
6 1 3 5
9 7 6 3
7 8 6 2
2 4 9
7 2 4
9 5 6 8
6 8 3 2
Hard #4
9 1 8 3
8 7
5 6 2 8
1 7 5 2
6 1 8 5
5 6 9
6
1 7 3 2
3 2 5
Hard #5
7 1 3
1 3
6 9 4 8
2 5 4 6 9
1
2
2 4 5 9 6
3 8 9
7 8 5 1 4
Hard #6
4 5 3 6
6 3 9
1 3 8 4
2 3
2 1 3
5 4 2
9 7 3 2 5
4 9 8
7 8
Hard #7
3 8
2 7
2 1 6 7 8
6 9 3 1
5 2 9 8
3 8 4
8 4
1 3 5
5 2 4 8
Hard #8
2 6 7 8
9 5 8 4
4 5 2 7
8 9 1 4 6
6 3 9 8
5
7 4 1
5 6 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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