Printable Hard Sudoku

Set 12m9nf6. 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
4 9 2 5
4 3 8
5 1 3
9 7 6 5
6 2 1
1 3
3 2 6
2 7 4
9 2 6 4
Hard #2
8 5 6 2 3
7 4
3 9
6 9 7
4 1 3
7 3 5
9 1 2
3 7 1 6 8 9 5
2
Hard #3
5 2 3
5 4 9
4 9 8
7 9
6 9
8 2 3 7 1
6 5 4
3 2 8 9
5 7 9 4
Hard #4
5 7
1 3 5 9 7
4 2
8 3 6 2
9 1 8 7
6 5
3 9 1 6
6
7 4 3 9 8
Hard #5
8 5 7 9 1
6 9 8
9 1 2 4 5
1 4 6
4 9 3 2
6 7 1 2
3 5 4
1 7
Hard #6
5 3 4
9 2 5 1
4
6 2 7 4
7 3
1 4 7 8
3 5 7
1 8 9 3
8 4 9 6
Hard #7
6 8 3 2
7 4 1
1 2 4 3
3 2 4 8 9
9 2 6
6 3
5 4
8 6
8 2 5 7
Hard #8
9 1 5
8 2 4
1 8 9 5
2 3 9
5 7 6
4 8 3
8 9 7 5 2
9 7
2 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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