Printable Hard Sudoku

Set 12hnpv2. 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 1 6
9 5 1 3 2
1 8 7 5
4 7
6 5 8
1 9 6 7
6 2 1
8 7 4
1
Hard #2
3 7 1 9
9 5 4
2 5 1 4 3 6
2
9 6 4
1 8 9 3
6 4 5 9 8
4 5
2
Hard #3
1
4 2 6 8
3 4
2 8 1 5
5
8 1 6 5 7 9
2 6 8
6 4
7 8 9 5 6 2
Hard #4
4
1 6 5
2 6 9 5 3
3 5 2
6 2 3 4 7
1 7 3
2 9
5 4 9
3 6 5 4
Hard #5
2 1 8 9 6
4 6 1 8
5 1 3
2 4
8 4 1 2
3 5 9
3 4 7
3 7 4
4 6
Hard #6
2 5 1
4 7 6 9 3 8
7
6 4 8 5 3
5 7 4
4 2 7 1
2 7 5 4
4 9 6
Hard #7
1 9 4 2 5
8 4 6
5 1 3
7 1
8 7
7 3 5 8
4 1 3 9 6
9
3 1 2 8
Hard #8
7 9 1 8 3
8 1 9
2
1 5
4 3 6 2
9 1 3
3 5 4 2
4 7
4 2 3 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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