Printable Hard Sudoku

Set cz370. 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 4 1 8
8 1 7
2 6
7 2 3
8 5 9
3 6 4
4 6 5
6 3 5 9 1
3 9 2
Hard #2
7
9 8 1 7
2 5 1 4 6 9
1 7 3 5
4 6 5 9 7 1
9
5 3 2
6
4 3 6
Hard #3
9 1 7 3 6
5 2 6 1 8
1 3 2 9
3 9 7
5 7 8 2
4 1
2 9 3 8
7
5
Hard #4
4 6
9 3 2 5 8
2 4
7 8 4
5 6 1 8
5 6 3 2
1 3 9
3 6 4 5
1 2
Hard #5
3 4
6 8 1 5
3
7 8 9
1 6 3 2
4 3
1 7 4
4 5 6 8 2 1
7 4 1 5
Hard #6
8 1 3 4
4 6
4 8 7 1 2
1 7
6 7 4
6
4 1 5 6 3
3 5 7 9
7 8 2
Hard #7
4 7 2 6
1 6
8 6 7
6 2 9 3
5 3 6
3 1 8 2
2 9
3 1 9
5 4 3 8
Hard #8
8 7 6 5 1
6 4 9
3 6 4
9
2 5 4 6 3 7
5 4
6 2 3
4 8 1
8 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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