Printable Hard Sudoku

Set p7o0nu. 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
1 2 8 6 3 4
6 9 2 3 4 1
6 4 9
6 5
5 7 1 4
6
2 1 3
1 5
Hard #2
3 1
9 7 3
6 1 5 4
1 8 5 2 7
2 9 5
6 2 8
5 1 2 9
1 9 7
8 6
Hard #3
5 1 2
9 8 5
4 1 7 9
8 6 7 3
5 3 4 2
2
2 3
7 5 8 9
3 1 8 4
Hard #4
3 8
7 9
9 7 2 6
4 6 3
6 1 3 4
3 1 6
2 8
5 9 6 7 2
4 5 8 3
Hard #5
9 2 3 6
9 3 8
8 2
1 8 5 2
5 7 8
7 4
1 9 8 4
4 5 3
5 4 7 2
Hard #6
2 9
7 6
5 8 2 7
8 4 7
9 6 3 8
3 5
2 6 8
1 3 4
4 7 6 8 2 3
Hard #7
6 3 5 2 1
5 6 4 3
9 1
7 4 5 6 1
2 7 9 5
9 4
7 3
4 9 8
1 8
Hard #8
9 1 8 4
7 5 9 3 1
2 6 4 3
3 7 2 9
6
1 3 6
2 8
6 3 2
1 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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