Printable Hard Sudoku

Set ndwdq7. 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
5 3 6
1
8 4 3 7 1 5 2
9 4 5 6
6 9 4
2 6 8
1 2 7
6 4
2 1 5
Hard #2
3 8 5
6 1 7 8
8 4
9 6 8
4 3 2 9
1 9 4 7
2 1 7
1 9 8
1 5 2
Hard #3
4 8 5 3 2
3 2 8
7 4 1
6 2
9 1 5 6 3
1
3 8 6 2
6 7 5
1 9 8
Hard #4
3
4 8 1 5 2
5 9 3 1
7 2 5
5 4
9 3
4 1 8 6
1 5 4
9 4 8 1 3
Hard #5
4 6 3 8 9
2 1 7 5 4
5 7
3 6 5 9 8
7 5
9 4 7
4 1 3
1 9
4 8
Hard #6
6 4
3 2 8
9 2 7
1 8 3
5 7 1 4 2 3
4 3 9
6 7 2 9
4 9 3
8 5
Hard #7
6 5 7 3
1 9 6 2
8 4 1 5
6 7 1
5 1 2 4 9 8
6 2 5
4 8 5 1 6
Hard #8
5 7
4 1 6
9 5
4 6 9 5
1 5 4 9
7 8
2 7 3 4 9
8 5 4 1
9 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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