Printable Hard Sudoku

Set 1ngmx6a. 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
9 1
7 4
6 7 4 5 3
9 2 3
3 4 2 7
1 8 2
8 2 3 5
6 9 4
4 5 8
Hard #2
4 1 2
2 3 8 4
6 8 1 5
4 8
2 7 3 8 6
3 5 9 6 4
1 3
5
7 2 9
Hard #3
7 5 9 8
5 4 3
3 1
8 2
5 6 7 8
4 2 7 1
3
5 6 2 4
1 2 9 5 8
Hard #4
1 7 6
3 2 1 7 9
6
2 5 7 8 6
8 2 4 5
8 4 3
9 3
1 6
8 2 6 7
Hard #5
7 6 4
2 4 8
9 8 5
6 9 7 3
5 4 2
3 6
1 3 7 9 4
4 5 3 8 2
5
Hard #6
2 3 1
3 9 7
1 4 2 8 5
6 5 4 7 2
1 9 3 7
2
6 8
2 5
2 9 1 6
Hard #7
2
6 9 3 4
4 3 1 5 6
5 8
1 6 5 7
4 8 9 5
5
3 6 1 9
8 7 6 5
Hard #8
7 8
1 6 5 2
6
3 9 1 7
2 4 6 9
8 9 3 7 5
7
4 7 5 3
1 9 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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