Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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