Printable Hard Sudoku

Set 15pp08k. 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 5 2
7 2 1 3 5
1 2 9 6
7 6 3
5 4
1 3 4
8
8 9
5 9 4 3 2 8
Hard #2
7 3 5
4 7
5 9 4 6 2
6 7 4
8 9 1
1 2 8
8 2 4 1 5
3
3 5 7 6
Hard #3
6 7 5 4 3
4 6 8
3 8 6
6 5 7 1
6 1 9
5 8
5 1 2 3
7 4 5
4 7
Hard #4
1 5 9
7 6 3 8
8 9
9 4
7 8 1
6 8 2 7
4 5 1 2
3 6 4
2 8 9 6
Hard #5
7 1
8 9 5 7
2 9 1 8
9 8 1 7
7 6 3 2 1
3 2
9 3
6
5 6 8 9 4
Hard #6
9 4
8 3 5 1
7 6 8 4
6 9
6 3 2
3 7 1 8 6
7 5 3
1 9
9 7 3 8
Hard #7
2 1 6
4 3 2
3 5 8 4
6 5 2 7 1
9 1 6
7 5
3 4 5 7 9
9 1 2
8
Hard #8
5 9 3
7
3 1 5 8 9
5 7 8
4 6 1 7
6 2
3 2 8 1
4 3 6 9 2
1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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