Printable Hard Sudoku

Set 3c1smb. 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
7 3 1
1 7 5
6 8 3
9 5 6 2
7 1 2
6 3 4 9
9 4 5 6
9 2 5 8
2
Hard #2
2 1 5 7 8
1 9 8 5
2 3
5 4 6 1 3
9 3 7 1
8 5
5 6 4
5 9
1 6
Hard #3
4 7 3
3 6 5
9 1 2
9 5 3
8 3 7 9
8 4 2
2 6 4 9 5
5 8 6
3 1
Hard #4
5 2 3 1
4 2
7 1 6 9
3 9 1
9 4 6 7 2
1 8
2 5 1 8
8 7
3 6 5
Hard #5
5 7 3 2
3 9 7 2 5
4 6 5 3
4 8 9
2 6 5
1 9
7 4 3
4
2 5 7 6
Hard #6
4 3
8 1 2
3 9 1 6 2 8
2 4 3
8 6 4 5 2
7 4
5 6 9 7 1
4
3 6
Hard #7
9 3 1 5
6 9 7 2 8 1
5
9 1 2 8 7
5 9
3
3
8 4 1 9 5
5 6 7 4
Hard #8
7 1 4
4 1 8
2 8 9 3 7 4
9
1 2 5 6 9 3
7 2
3 5 6
6 7 9
3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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