Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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