Printable Hard Sudoku

Set s9vk9h. 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
5 7 2
8 5 2 7 4
7 1
4 5 2 8 3
5 4 8
9 1 7
3 5 7
4 2
4 9 5
Hard #2
4 6
1 4 5 2
3 8 5 9 6
5 3 4 6
7 2 1
3 1 9
8 9 7 4
9 5
1 8
Hard #3
4 9 3 8
6 7 9 8 2
8 7 9
3 8 4
1 7 2 4 3
7
9 3 1
2
8 4 5 3
Hard #4
6 5 4 2
1 2 7 8
4
3 5 4 1
1 9 3
4 7 6
9 5 2
7 6
2 7 6 4 3
Hard #5
8 1
5 4 6
1 5 8 4
1 3
8 9 2 3
9 2 6
3 1 8 5
4 1 7
8 9 2 6
Hard #6
4 7
4 1 3
9 3 8 6
7 3 4 9 8
3 1
2 9 6 7
6 1
4 6 9
9 7 2 6
Hard #7
5 2 6
8 4 2 1
3 4
1 9 4 5
7 2 1 3
3 6 8
9 8 5
2 3
1 9 2 4
Hard #8
9 3
7 8 6 1
6 5 3 9
1 3 5 7 8
2 4 9
2
7 5 3 8
2 7 9
5 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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