Printable Hard Sudoku

Set c5aaou. 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 4 7 8
5 2
4
2 5 6 8 9 4
3 1 5 2
5 2
4 3 1
8 7 1 6
3 2 4
Hard #2
9 6 8
4 8 2 3 6
2 5
7 1 3
8 6
3 1 4 8 5
5 4 2 7
5 4
3 7 6
Hard #3
6 8 7
1 8 6
6 1
4 9 3
6 9 5 8 4 1
8 3 7 2 5
1 9 2
7 8
5 4
Hard #4
2 5 1 3 8
1 6
7 2 3
7 3 4
9 8 7
6 9 2 1 8
8 7 6 5
4 5
2 3
Hard #5
9 2 8
8 5
7 9 1 4
5
2 5 7 8 6
8 3 1 9 2
2 3 6
8 1
4 2 9 7
Hard #6
6 7
3 2 5
4 6 8 7
5 8 6 4 1
6 3 9
4 5
2 4
9 8 3 7
1 2 6 8
Hard #7
6 9 5 3
2 6 7
1 3 8 6
9 7 1
5 7
6 4 9
1 2 5 7
9 3 5
4 8 9
Hard #8
4 8 7
1 9 8 2 5
2 9 6
1 5 4 8
4 2
3 1 4
4 1 7
5 8 4
7 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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