Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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