Printable Hard Sudoku

Set 1nm59yo. 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 7 4
6 8 9
6 1 2
4 5 3 7 8
7 8 2
5 6 9
3 2 6
3 6 4 7
2 1
Hard #2
9 3 6
2 5 1
4 5 8 1 2
7 2
3 2 8 9 4
7 6 3
8 4 7
5 1
9 1 3
Hard #3
2 3 7 1
9 3
4 5
9 7
4 1 2
1 6 5 2
9 7 2 6
7 4 3
3 5 7 4 2
Hard #4
9 6
4 7 3 8
1 4
9 7
7 4 2 1 8
1 6 7
6 3
8 6 9 1
5 4 8 9 7
Hard #5
3 1 4 6
9 5 6 7
1 2 8 9
4 9 1 5
5 2
5 2 9 7
7
6 4 2
1 9 6
Hard #6
4 5 6 2
8 2 9
2 3 8 4
3 2 9
2 1 3 4
1 9 5 7
6
7 2
4 2 7 3
Hard #7
1 6 8
7 1
4 1 3 7 9
8 5 2
1 2 4 9 8
9 8
2 7 5
5 9 8
9 4 5
Hard #8
7 1 5 6 3
8 5 1
2 4 7
6 5 8
8 7 6 3
9 3 6
4 1 5 3
6 7 3
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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