Printable Hard Sudoku

Set 15gzhq0. 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
9 8 6
7 2 5 3 1
1 9
8 2 9 7
5 2
3 9
4
9 3 1 7 6
5 1 6 3 9
Hard #2
4 9 6
1 6 8 2 9
1 7
2 1 4 5
5 8 3 1
1 7 9
8 9 4
7 3
5 3 9
Hard #3
3 5 8
7 1 8
4 1 2 9 3
1 4 2 9
4 1
9 7 3 8
8 9 3
7 6 1
6 9
Hard #4
2 1 6 9 4
3 5 1 8
6 8 7 1 5 3
1 9
2 9 7
8 5 3
6 1
9 4 7 2
Hard #5
5 2 9
1 2 4 8
7 1 3 2
9 4 6
3 2 5 4
4 3 1
5 6 9 3
8 3
3 9
Hard #6
2 8 1 3
1 9 4
5 8 1
8 5 2
6 1 7 3
5 9
9 5
4 5 9 7 1
6 7 2
Hard #7
1 3
3 9
4 3 7
7 8 1 3 5 2 6
2 6 9 7
4 5 2
9 5 2 3
6 9
1 4
Hard #8
5 6 3
9 6
6 3 5 4
1
3 8 4 1 5
8 4 9 6
5 3 6 9
2 8 7
6 8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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