Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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