Printable Hard Sudoku

Set 1hm39x7. 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
3 9
7 6 5 4
1 4 3 6
6 8 2
1 9 6
5 7 1 2
3 6 8 1
1 4 5
1 9
Hard #2
3 9
2 6 5 3
7 1 5 2
1 3
6 8 1
7 3 4 2 6
7 2 4
5 3 9
9 6 4
Hard #3
8 7
4 9 6 1
5 1 9 2 8
8 6
8 4 9
6 5 7
8 6 7
7 4 9
1 5 3 7
Hard #4
1 9 2
6 4 8 7 9
1
7 9 3 5
6 3 2
1 4 6
4 5 9
6 1 5 7
3 8 4
Hard #5
5 6 3
4 5 9 7
8 1 4
6 8
8 2 7 5 1
2
5 6 2 1
2 8 3
9 1 7 2
Hard #6
4 1 5
3 7 4 6
6
5 8 7 3
2 4
7 6 2
8 6 1 9 3
5 9 8 6
7 8 2
Hard #7
7 9 8
8 2 1 6 3
5 1 4 2
4 7 9
1 9 2 8
6 3 5 1
3
6 1
9 4 8
Hard #8
5 1
4 2 3 5 7
8 9 6
6 3 9 7 8
4 6 8
7 3 9 1
6 8
1 2 4 9
6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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