Printable Hard Sudoku

Set 13dcqr. 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 8 6
4
2 9 7 8
9 8 1 6
6 2
8 5 3 9
8 5
1 6 5 3
7 9 2 6
Hard #2
2 3
4 1 9 2
9 6 4
4 2 5 6 3
1 8
5 6
5 2 8 7
5 9 3 1
7 1 5
Hard #3
4 6 9
6 3 4 7
7 9 3 4
1 7 6
2 5 8
6 5
5 2 9
4 8 7
9 6 1 2
Hard #4
7 4 8 9 3
8 5 9
9 2 5
7 8
9 5 6 2 8
7 4
3 8
2 7 4 6
5 9 1
Hard #5
3 9 2
4 7 9
8 5
8 1 5 4
2 5 3 1
6
7 3 5 2 8
8 4 5 2
4 3 6
Hard #6
4 6 1 9
5 3
9 8 5 1
1 7 6
5 9 3
3 1 4 2
4 7 3
6 5 2
9 8 4
Hard #7
8 1
4 1 2
5 9 7 4 8
5 8 9 3
7 9
1 6
4 9 1
2 1 9 7
1 6 7 5
Hard #8
4 6 2 7
9 3
2 7 1 5
2 8 6
8 3 1 5
4 1 5 9
9 2 7
2 3 1
7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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