Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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