Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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