Printable Hard Sudoku

Set cn9mu7. 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 6 7
7 1 4 5
5 8 6 4
7 2 9
6 5 8 3
1 3
8 3 7
6 4 5
9 5 6
Hard #2
2 8 6
6
9 5 6 2
5 9 2 3 4
7 3 5 6 9
3
5 3 9 7 8
7 4 5
6 8
Hard #3
9 8 1 5
7 4 3
9
2 7 3 5
4 1 8
4 2 6 8
3 8
6 4 8 2
2 9 4 1
Hard #4
7 1 4 6
2 1 8 6 3 5
7 5
1 3 5
2 4 3 6
7 6 4 3 1 8
4 9 7
4
Hard #5
1 3 6
7 1 8
2 3
3 1 9 4
4 1 5
4 9
3 1 6 4
4 8 1
5 8 4 7 3
Hard #6
3 1 9 7
2 4 1
9 3 2 5
8 7 6 9
7 5 1 8
3
1 2
8 2 4
5 2 8 6
Hard #7
4 7
2 8 5 1 9
3
7 6 1 9
9 5 8 4
3 4 1
6 2 4 1 7
2 8
3 2 4
Hard #8
3 5 2 8
7
6 5 1 7
8 3
7 4 5
1 6 4
4 7 9 6
7 4 2 8 5
5 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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