Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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