Printable Hard Sudoku

Set 165njsb. 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
9 8 7 1
5 7 9
1 6
2 6 9 4
9 1 2
1 2 3 4
8 3 7
5 1 6 8
6 2
Hard #2
9 3 1 4 5
7 8
9 8 6
9 8 7
4 7 2 1 5
6 3
8 4
7 4
2 1 7 5 6
Hard #3
2 9 4
8 1 7 3
7 4 2
8 6 3 9
6 1 9 8
9 1 8 7 4
5 2
7
3 1 4
Hard #4
9 7
4 3 6 8
3 8 2 4 7
2 3 5
7 9 2
8 9 1 7
6
7 4 8 3
5 8 9
Hard #5
2 8 9
7 3 4
8 3 6
4 6
9 5 2 3 1
2 7 3
6 4 9
8 5 2
9 6 3 7
Hard #6
2 5 6 8
1 2 9 3 5
9
4 7 3 8 9
9 7
8 1 6
6 9 3
7 2 4
9 7 1
Hard #7
4 9
7 4 8 3
6 1 4 2 7
1 2 3 8
8 3 5
6
2 9 8 7 6 4
6 1 5
5
Hard #8
8 3 2
7 5 4
4 8 6 7 3
5 8 2 9
8 6 4 3
7 2 8
8 2 1 6
7
5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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