Printable Hard Sudoku

Set ns8moc. 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
7 9 2
8 7
4 3 6
8 5 2 1
7 9
7 1 5
2 3 9 4 5
4 9
6 5 9 2 1
Hard #2
1 2 4
9 8 5 6
5 1
7 5 3
8 7 9
4 3 6 1 5
8 1 4
3 8 5 9
6 2
Hard #3
6 7 5
8 4 3 2
7 1 8 6
5 4 8 2
1
7 3 8
3 7 1
8 2 5
6 8 3 1
Hard #4
8 6 5
9 8 3
1 9
9 1 6
5
4 7 6 2
1 5 9 8
2 9 4 3
8 3 1 4 7
Hard #5
9 2 3
5
7 3 9 2 6
6 7 2
8
2 1 4 6
7 5 8 2
9 1 8 4 7
6 5 2
Hard #6
2 5 9 4 6
9 8
5 4 7 6
1 9 3 4
3 9
7 1
7 5 6 8 3
9 5 4 6
8
Hard #7
4 9 5 3 6
8 3 5
2 6 9 1
9 4
3 1 5
6 9 8 2
6 2
8 5 6
4 1 9
Hard #8
1 7 5
5
7 3 9 8 4 2 1
1 9 4
7 1 8
3 5
3 8 5
4 7 9 2
2 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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