Printable Hard Sudoku

Set 172vh96. 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
6 1
9 7 2 8
2 8 5 1 7
9
6 7 4
1 2 9 3 8
6 4 1 7 5
9 4 7
5
Hard #2
7 3 9
4 8 9 1
2 4 8
2 9 3 8 1
3 4 2
1 7 9
4 1
6 8 1 5 7
2
Hard #3
3 9 8 1
6 7 4
9 3 7
5 2 3 7
4 6
3 6 8 5 9
7 5
8
4 5 2 9 6
Hard #4
2 9 7
7 1 3 2
1 4 7
1 3
7 3 2
8 5 2 1
2 5 6
7 8 5 2
9 5 4
Hard #5
3 2 7 9 5 1
7 6 3 8
5 2 6 7
1 2 8
5 4 8
1
1
2 5
7 8 6 4 9
Hard #6
2 3 6 5
5 7 6 4
5
8 3 9 5
1 8
6 8 1 2
7 1 5 3 9
6 2 3 9
4
Hard #7
1 4
6 9 1
9 7 3 8
7 5 8
4 1 2 5
7 4
5 7 4
6 3 2
8 3 2 4 7
Hard #8
4 2 1
1 9 8 7
5 7
6 3 1 2 5 9
8 6 7 1
9 2
8 3 9 1
1 4
2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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