Printable Hard Sudoku

Set 8c7a10. 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
3 9 2
4 7 9
8 5
8 1 5 4
2 5 3 1
6
7 3 5 2 8
8 4 5 2
4 3 6
Hard #2
4 6 1 9
5 3
9 8 5 1
1 7 6
5 9 3
3 1 4 2
4 7 3
6 5 2
9 8 4
Hard #3
8 1
4 1 2
5 9 7 4 8
5 8 9 3
7 9
1 6
4 9 1
2 1 9 7
1 6 7 5
Hard #4
4 6 2 7
9 3
2 7 1 5
2 8 6
8 3 1 5
4 1 5 9
9 2 7
2 3 1
7 3
Hard #5
2 7 4 1
1 4
8 3
7 5 9 4
3 2 7
6 1 2 8
4 9 7 5
1 3 9 2
6 1
Hard #6
6 2 4
6 5 3
9 7 1
9 5 8 7
4 9 6
2 7 6
8 1 2
5 7 4 8
2 1 6
Hard #7
6 5
4 8 9 6 2
1 3 2 5 8
3 8 2 4
6 7
1 4 6
9 3 1
1 2 9
6 4
Hard #8
3 9
9 6 2 3
7 4 1 5
9 3 4 7
5 2 1 6 8
4 1
2 5 7 6
4 1
3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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