Printable Hard Sudoku

Set 1ov1x0. 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 1
4 6 2 9 8 1
5 8 2
2 9 5
1 6 7
1 3
9 5 4 6
7 6 8 9
6 3
Hard #2
7 5 1
6 4 1 3 7
9 8 7
4
3 2 8 9
5 3
1 5 6
4 9 3 1
2 9 6 4
Hard #3
9 8 6
1 8 7 4
4 5 3 7
1 3 6
5 3 2
3 6 4
2 3 6
5 7 4 8 1
9
Hard #4
7
6 5 3
7 3 2 8 4 1
8 2
5 7
8 4 9
3 5 9 4
9 6 3
8 5 7 6 2
Hard #5
8 2
3 2 4
7 8 5 4 1
4 7 8 3
2 1 9
6 9 1
7 4 5
8 1 6 7
9 2
Hard #6
4 2 8 7 6
2 3 9 8
5 2
2 8
4 6 1 5
6 8 4
9 1 5
5 1 9 7 2
3
Hard #7
2 5 7
4 9 3 8
2 1
1 7
8 6 7
7 2 8 4
5 4 1 6 2
3 9 5
1 9 6
Hard #8
7 8 1 5
1 3 6 8
3 1 9
4 1
3 9 5 6
4 8 2
1 6 2 4 7
8 5 6
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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