Printable Hard Sudoku

Set 1n17f4a. 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 8
7 8 9
4 5
7 1 2
7 5 4 8
3 4 6 8 7 5 1
9 7 3
8 4 2 6
5
Hard #2
7 3 4 8
9 3
6 4 7
1 7 4 6
9 6
6 8 5 3
3 4 5
4 9 2
9 8 7 2
Hard #3
4
9 5 2 3
4 3 8 2 6
7 5 2
1 5 3 6
2 7 9
2 7 6
9 1
8 2 1 7
Hard #4
3 6 7 5
3 6 4
4
4 8 7 2
7 4 3 9 5
1 7 3 6
9 2 7
7 1 2
4 5
Hard #5
5 4
9 5
4 8 3 2
1 6 4 2
5 6 9 7
2 4 8 3
1 9 7 2
6 3
9 3 6
Hard #6
6 9 5 2
5 3 4 6
3 5
9 7 2
9 2 4
6 1 9
5 3 7
2 9 6 4
7 8 9
Hard #7
3
8 9 2
3 2 6
6 4 9 1 8
9 8 6 5
7 1 9
7 1 2 8 3 9
9 2
3 7
Hard #8
4 3 7 8
8 3
1 9 3
8 2 4 9
1 6 3
4 6 1 7
5
7 2 9 1
6 2 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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