Printable Hard Sudoku

Set 17on0o8. 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
2 7
5 6
3 1 4 5
4 8 5 3
5 8 3 9
3 1
7 4 8 5 1
8 7 3
6 9 7
Hard #2
1 6 9 2
9 2 7 6
8
8 7 5 2 3
9 2 5 7
8 1 5 9
6 3
7 9
1 2 7
Hard #3
9 1 3 8
2 6 7 9 5
1 9 3
6 4 3
4 5
5 7 9 2 1
2
6 8 1
1 5 7
Hard #4
2 5 8 1
4 8
5 3 6
9 3 8 1
8 3 4
1 6 7
4 7 9 2
7 3
1 6 4 8
Hard #5
2 1 6 5
1 8
3 5 7 1
7
5 4
6 1 2 9
1 2 8 4 9 5
3 4
4 2 9 1
Hard #6
7 5
1 8 3 7 2
9 2 4 6
4 1 5 3
2 5 8
8 1 7
7
4 3 8 2
2 1 3
Hard #7
1 7 8
4 2
7 1 5
2 6 1 8
9 3 5 6 7
6
7 3
5 1 9 4 3 2
3 8 9
Hard #8
6 8 2 5
5 7 9
4 7
7 2 8
2 1 5
8 5 9
4 5 6 3 1 7
1 6 4
3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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