Printable Hard Sudoku

Set stqp17. 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
8 4 3
8 1
7 3 5 8
9 4 1 2 6
2 7 8
8 3
4 8 9 6 5
9 1 4
5 8
Hard #2
1 9 2 8
6 2 9
2 3 1 8 5
5 7
4 6 1
3 6 9 5 8
9 2 3 4
4 9
8
Hard #3
5 2
6 9
9 7 4 6 8 5
1
8 2 6 3
6 3 7 4
7 4 8
4 5 6 7
8 2 9
Hard #4
4 2
3 9 1 4
7 3
1 8 4 9
9 2 3 7 1
4 6 1
2 7 5 9 4
7 2 6
6
Hard #5
6 9 5 3
9 1 8 4
5 8
4 6 9
6 3
7 3 2 5
5 4 9
3 1 7 6
2 8 7
Hard #6
3 2 7 5 9
8 9 2
7 1 4 8
5 4
8 1 4
1 9 3
6 2 3 5
7 5 2
1 4
Hard #7
1 6 8
3 8 7 9 2
1 2 5
7 3 2 5 6 1
1 4 2
8 7 3
6 8 3
2 3
8
Hard #8
4 9 8 7
1 8 5 9 2
7 4
7 3 2 4
4 3 5
1 2
6 5 7 2
3 1 7
6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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