Printable Hard Sudoku

Set 16zx9um. 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 2 6 3 5 7
7 8 1
8 6 2
5 1 6 4 3
5 7 4
2 9 3
4
Hard #2
2 3 9 1 5
3 5 1 4
1
6 3 7 2
5 8
9 3 7 4
5
8 9 3 2
4 3 8 7
Hard #3
6 4
9 6 5
5 1 2
9 8 5
6 7 9
3 9 1 4 2
4 5 3
1 4 6 7
8 7 2
Hard #4
4 2 1
8 2 3
9 7 1 2
5 1
7 3 9 8 5
6 4 2
9 4 8
8 1 4
3 5 6
Hard #5
7 1 5 6
6 4
2 4 6 1 3
8 9 2
1 8 4 2
7 1
5 9 3 4 8
8 7 4
5
Hard #6
5 6 7 3
9 3 2
7 8 9 6
9
1 8 7
7 2 3 1
3 4 2 1
6 7 4 1
8 3
Hard #7
2 1 6
8 4 5 6
7 3 9 2
4 6 1 2
4 9 5
2 4
8 6 9 2
8 9 5 7
5
Hard #8
7 9
2 4 6 3 7
8 2
1 9 2 6
6 7 2 8
8 3 6
5 7
3 8 5
2 1 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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