Printable Hard Sudoku

Set 567xun. 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
1 2 4 3
3 8 5 4 1
2 6 5
7
4 5 9 2
7 4 8
4 9
8 3 6 4
Hard #2
7 4 5 3 1 6
6 3 4
1 2
8 5 1
4 5 8 9
6 2 3
8 7 6
5 7 2 1
3
Hard #3
7 4 3 2
5 9 4
5 3 9 8
2 7 5 6
8 9
3 7 5
3 1 8
4 8 7
2 3 4
Hard #4
4
9 4 6 5
2 5 8 3 9
7 1
6 3 5 2
9 4 7
5 6 9
8 4 7
3 2 1 4
Hard #5
5 4 7
3 4
9 1 5 8 6
8 2 7
6 5 9 4
9 7 1
8 3 1 4
1 2 5 9 3
Hard #6
1 2 7
9 3
7 5 2
9 1 8
6 4 3
1 9 6
4 6 9 5
7 1 5 4
2 8 9 7
Hard #7
7 1 3
2
6 1 2 3
4 7 6 8 1
9 7 3
8 1 4 7
8 4 3 9
4 2
3 2 6
Hard #8
2
3 5 2 9
4 3 7 2 6 5
2 4 6
3 7 6 5
9 3 1
6 8 1 5
1 4
3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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