Printable Hard Sudoku

Set cr6hts. 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 2
4 9 6 1
4 9 6 8
8 2 1
3 8 4 6
1 8
4 7 5 3 2
6 3 4
5 6
Hard #2
2 6 8
4 2
1 4 9
7 2 3
6 4 3 2 7
3 9 1 4
6 4 5 9 1
2 6
8 5
Hard #3
9 6 4 5
3 7 2 9
8 6 7 1
4 2
1 9 4
3 7 5 1 9
9 7 3
1
9 6 8
Hard #4
5 9
3 8 2
8 4 6 3
1
6 8 3 4
5 9 6
6 2 7 1
7 2 9
9 1 5 8 2
Hard #5
7 9 8 5
8 2 5 4
3
8 7 3
6 1 7 3
2 5 8
2 5 3
1 4 5 2
9 6 4
Hard #6
1 4 6
2 8 4 1 5
1 9 7
6 3 7 8
8 1
5 4 9
5 7 8
5 3
4 3 1 5
Hard #7
6 2 3
3 7 4
7 8 4 6 2
4 5 9
2 3 9 7 1 4
9 6
9 1
5 2 8
1 5
Hard #8
8 2 6
4 2
4 6 2 3
6 9 3 5
8 5 1 4
7 3
8 5 4 1 7
7 5 6
3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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