Printable Hard Sudoku

Set hm7ngm. 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
7 2 6
1 6 8
5 1
2
6 9 8 1 2 3
4 7
4 2 6
6 5 1 2
2 3 7 5 8
Hard #2
8 9 2 4 7 6
1 5 9 3
5 4
9 4
2 7 9 6
6 3 1 4
7
7 4
2 8 5 1
Hard #3
2 8
9 1 4
6 5 9 7
1 7 4 8
7 2
3 5
3 4 5 1
8 3 6 1 4 7
1 6
Hard #4
4 3
9 3 7 8 1
7 8
8 2
8 1 9
6 5 1 7
9 5 4 3 6
1 3
7 8 1 9
Hard #5
3 9 8 2 6
8 1 9 6 7
2
1 3
7 4 8
8 9 7 5
6 8 3 4 9
2 9 1
5
Hard #6
1 6 7
8 5 1
9 7
4 3 8 2
6 9 1
2 7 3
2 4
6 3 8 4
2 4 1 5 8
Hard #7
6 4 1 5
8 9
2 4 5
7 3 1 6
4 6 7 8 3
4 1
1 2 3
6 9 3
8 3 2
Hard #8
2 3 6
1 6 7 2 3
5
4 5 2 3 6
3 7 1 6
9 3 4
1
8 4 7
5 9 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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