Printable Hard Sudoku

Set 1nkhd6m. 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 6
6 3 2 5 8
5 4 7 3 6
9 2
6 8 1 4
1 6 7
9 5 1 7
5
7 6 2
Hard #2
2 1 9
4 3 6 2 7 5
6
4 7 8 6 3
6 4 9 8 5
5 8 7
3 1
9 7 6
5
Hard #3
6 5 8 1 4
1 9 8 4
3 8
9 3
6 2 4
5 1 2 6
9 5
8 6 1
1 4 7 3
Hard #4
2 9 5
1 8
7 6 3 5 4
1 5 4
8 7 5 4
6 8 9 7
6 2
4 7
2 9 1 6
Hard #5
7 3 1 5
3 4
5 4 2 7 9
4 3 1
8
5 6 3
8 1 9
9 5 6 1
8 4 5 7
Hard #6
3 7 2
2 8 9 4
6 9 3
4 9 2
4
5 8 3
7 3 2
9 2 3 4 6 7
8 7 5
Hard #7
4 9
3 7 6
8 3 7
6 5 8 7
1 5 2 3 6
9 4 5
4 1 3 2
2 9 6
4 1
Hard #8
3 9 8
8 7 2 9
2 1 5 7
7 3 9 4 8
8 1
2 6 9 1
6 4 7
3
4 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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