Printable Hard Sudoku

Set 13s6qb. 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
1 3 2
2 9
5 9 2 3 4 7
4 3 6
3 2 9 1
8 7 9
6 5 8 7
5 6
8 2
Hard #2
7
1 7 2 8 4
5 9
8 4 6 3
6 9 1
5 9
9 7 6 1 5 3
2 3 1
1 5 7
Hard #3
5 8
2 1 9
8 7 5 9 2
3 9 8
2 4
7 6 5
8 9 2 5 7
6 7 4
4 7 1
Hard #4
7 5 9 6
7 2 5
7 6 3
6 1
5 8 4 3
6 2 7 4 8
6 9 3
9 8
2 3 1
Hard #5
3 7
2 1 6 7 4
1 8 5
7 1 2 5 6
3 6 7
6 9
8 7 5
4 8 2
9 3 4
Hard #6
1 5
6 8 9 5 2
2 6 9 8
5 4 7 8
7 8 1
4 1 3 9
4 7
1 3
1 9 6
Hard #7
1 2 5 3
6 2 9 8 1
8 3
9 4 6 5
8 7 9
5 3 9 1
6 3 4 7
9 6
7
Hard #8
2 6 4 9 5
1
3 4 8 1
3 9 6 5 4
1 8 2 3
6 5
8
9 2 5
2 6 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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