Printable Hard Sudoku

Set 1kl6ctt. 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
1 2 6 8 5
2 6 1
4 2
9 5 8 1
1 3 7 4
8 3 7
7 6 8
3 1 5
4 7
Hard #2
3 9 7 5 8 1
5 2 7
4 1 6 3
5 6
3 4
7 8 9
1 2 7
7 4
9 6 3 5
Hard #3
4 6 9 7 5
8 2 6
3 7 2 4
2 4 1 5
3 7
5 1 9
9 5 1
2 1 3
4 8
Hard #4
3 4 1
2 1
5 1 7 3
8 9 6 5
9 4 8
3 4 1 7 8
2 5 9 6
9 4 1 3
Hard #5
7 6 2 3
3
5 8
5 6 1 4
9 7 8 6
5 8
6 7 4 2 1
8 2 9
9 4 7 6
Hard #6
7 3 5
3 5 6 8
4 2 5
8 5
6 2
6 9 2 7
3 8 4
4 2 8
2 1 5 3 4
Hard #7
9 7 5
3 4 6
6 5 4
8 4 6 2
5 3 7 4
4 5 9
9 6 2 1
7 3
1 8 7
Hard #8
7 1 6
3 6 8 9
1 2 8
9 8 2 7 4
6 3
5 1
4 7 6
9 8
5 6 2 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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