Printable Hard Sudoku

Set hhb8dx. 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
1 7 8 9
8 4 7
5 7 6
7 6 2 3
2 4 7
3 6
2 9 6 1
2 5
4 1 7 3
Hard #2
1 5 8 9
9 4 3
2 1
6 4
5 6
8 6 5 7 2
1 4 7 9 8 2
5
2 4 9 8
Hard #3
2 3 5
6 8 2 4
7 8
3 1 6
2 4 7 3
7 6 1
2
8 6 1 7 5
5 3 9 2
Hard #4
2 7 9
7 8 3
4 9 1
1 6 5
4 7 8 6
6 9 4
5 6
9 3 1
8 2 4 3 5
Hard #5
2 1 3
5 8 7
4 9 3 1
8 6 5 4
7
3 5 9 2
3 9 5 8 4
7 5 6
1 9
Hard #6
2 4 8 5
1
9 1 7
7 5 2 9 4
6 9 2
8 7 2 5
3 5 1
5 3 4
3 1 9
Hard #7
9 8 5
5 6 4
6 7 1
5 6 8 1 4
1 9 6
6 3 7
8 2 9 3
6 2
7 5 6
Hard #8
6 1 9 7
7 8 4 3
1 6 2
5 4 8
1 2 9 7
3 6
2 1 9
7 8 6
5 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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