Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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