Printable Hard Sudoku

Set hh9erg. 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
1 6 3 9
6 4 9 8 1
3 5 1
7 1 5 9 6
8 1
8 3
7 2 1
2 5 6
9 7
Hard #2
5 4 9 1 8 7
3
1 9 6
8 5 1
9 7 1
6 4 2
6 2 9 7
5 8
3 9 6 4
Hard #3
1 2
9 8 5 6
6 7 8
1 5
8 4 3
9 8 4 2
2 9 1
8 6 5 3 7 9
1 5
Hard #4
9 4 8
2 7
1 9 2
1 6 2
7 3 5
4 3 7 6 8
9 7
2 8 5
3 8 1 5 6
Hard #5
9 8
2 3 5 4 1
4 6 5 9
1 5 8
2 3 5 6
3 5 7
9 1 6 7
6 4 5
3
Hard #6
7 6 3
6 3
9 6 2 7 5
2 3 6 8
8 5 1 2
4
5 3 6
1 8 9 7
9 5 1
Hard #7
8 7 3 5
3 4 5 7
6 8
4 2
2 1 8
1 2
1 6 5
6 9 3 2 4 8
5 8 7
Hard #8
7 3 5
3 4 2
4 8 1 3 7
3 7 6
8 4 2
6 9 7
3 5 4
8 4 2 5
6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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