Printable Hard Sudoku

Set nscpk1. 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 1 9 7
5 1
8 6 1
8 9 5 3
2 7 9 4
5 1 8
1 3 7 8 5
3
4 9 6
Hard #2
2 6 9
4 7 6
6 5 1 8 3 4 2
9 8 1 6
6 1 8 2 9
5
4 1 5
9 4 7
Hard #3
2 9 5
5 6 8 9
4 2 9 7
2 5
3 8 7
4 6 1 9
4 1 9
8 9 1 4
8 3
Hard #4
2 7
9 4 6 3 8
8 4 5
8 9
3 8 1 7
4 5 2
9 4
6 7 3
4 2 6 1 9
Hard #5
9 3 1 2 7
2 6 3
6
9 8 5 2
7 5 4 3
2 6 5 1
1 4 2 7
5 6
4 8
Hard #6
6 7 5
8 3 4 9
6 3 2
2 1 8 9
3 6 2 4
8 6 1 5
5 8 2
2 6 4 1
Hard #7
9 4 5 7 8
1 8 9
7 3 4 2
3 9 4
7 9 1 5
4
2 7 8
5 2 6
3 1 2
Hard #8
3
5 7
9 1 8 5
8 9 3 1
5 2 9 7
6 9 8 3
1 4
6 7 2 4
5 7 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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