Printable Hard Sudoku

Set q7nscn. 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 2 3 1
6 1 9
3 7 8
2 3 9 4
4 2
4 7 5
5 6
9 2 1
1 8 3 9 6
Hard #2
9 3 8 7
3 2 1 6
9 3
4 2
2 6 5
7 5 1 3
4 9 7 5 2
5 9
7 6 1
Hard #3
5 1 7 9
7 6 8
3 8
9 6
1 6 4 2 8
8
6 3 1 5
3 7 9 2
2 6 7 3
Hard #4
2 4 7
5 6 2 7
8 1 6 5 3 2
9
5 1
7 1 8 2
3 2 7
1 4
8 7 4 9
Hard #5
2 3 6 1 4
7 9
9 6 1 4 3
1 9 2 7
4 7 9 1
3 8
7
4 3 8
5 3 7
Hard #6
9 3 1 7
5 6 3 4
8 9
8 9 7
8 4 1 5 9 3
7 6 5
9 5 1 3
6 9 2
Hard #7
4 7 6
3 8 7 9 2
6 2 3 1
6 1 3 8
3 9 7 1
7 8 3 4
1 5 9 4 7
Hard #8
7 1 6
3 7 9 4
4 2
3 2 6 9 5
7
5 1 3 6 7
8
1 3 2 5
9 6 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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