Printable Hard Sudoku

Set 1b9hzy7. 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 1 9 2 6
3 1 7
6 8
5 2 7 6
3 7
8 9 5
2 1 6 4 5
7 8 3
8 9
Hard #2
9 8 7 3
3 5 1 6 9 7
1
6 7 9 4
8 2 4 1
3 6
7
1 7 4 2 6
1 5
Hard #3
6 5 1 7
3 1 9 2 4
7 2 1 6
4 5 7 8 6 1
1 3
6
8 7 3
1 3 5 2
Hard #4
9 3 8
3 4 2 8 5
6 5 7
3 4 8
7 8 5 6 2
9 6
8 5 2
9
3 5 7 1
Hard #5
3 4 2
4 5 6
8 1
9 6 5
5 6 9 8 4
3 1
6
6 5 2 3 9 7
2 9 3 4
Hard #6
1 6 4 8
7 8 6
3 7 2
8 4 6 7
5 2 1
6 5 8 7 3
2 7 9
3 9 4
6
Hard #7
4 8
5 8 7
7 2 4
2 7
1 6 9 5
6 9 4
9 2 1
6 3 4 2 9
3 7 8 9
Hard #8
3 1 8 2
2 4 9
7 9 5 6
1 4 2 5
5 7
4 5 3 6
1
6 1 4 5
2 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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