Printable Hard Sudoku

Set cmob9q. 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 9 8 6
9 6 5 2 3
9
2 5 6
4 8 2
6 7
8 4 9
2 9 4 3 1
4 3 5
Hard #2
9 5 4
8 3 2 6
7 8 9
8 6 4
2 7 9
6 2 7
7 5
6 1 9 2 3
3 4 8
Hard #3
8 2 9 5 1
1
7 1 4 6
6 9 4
5 7 1 4
3 8 6
9 1 7 2
6 8 5 3
7
Hard #4
1 7 6 8
4 5 9
3 2 9
2 9 6 8 3
8 3 1
7 6
9 6
5 2 7
2 3 9 1
Hard #5
7 5 8
8 1 7
8 2 6
5 4 3
8 6 3 1
1 9 8
3 1 6 2
2 9 8
6 2 5
Hard #6
4 9 2
6 5 1
1 9 2
6 1 3
8 3 1 5 2
4 7 1
1 2 3 6
6 3 7 8
4
Hard #7
5 1 7
2 5 4 1 6
3 2 4
6 7 2
6
5 6 4
9 7 5 2
4 8 2
1 3 9 8
Hard #8
4 6 8 7 2 1
3 1 8
7 4 5 6
2 1 5
5 1
3 9 4 6
7 2 9
1 2
6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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