Printable Hard Sudoku

Set 959ot1. 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 3 5 2
6 1 8 7 3
7 5 8
4 7
6 1 5 8
2 9
8 2 9 6 7
4 1 8
7
Hard #2
8 6 9
5 4 2 9
6 5 1 8
1 3 9
6 4 9 1
1 3 5
1 3
3 1 6
4 5 7
Hard #3
7 3
4 9 1
2 3 1 6 7
6 8 9
6 1
9 5 2
8 3 4 7
1 2 9 5 6
5 3
Hard #4
6 8 9 1 7
9 4
1 3 6
2 4 6 8
4 3
6 7 2 5 9
8 4
9 2 1
1 7 5
Hard #5
2 4
9 4 2 5 8
1 7 4 6 5
5 8 3 9
6 5 1
3 8
2 7 5
9 3 1 5 7
Hard #6
4 5 1
7 3 4 8
5 1 6 8 3
3 6
6 9 7
2 4 5
8 5
6 7 1 3 2 8
2
Hard #7
8 6 3 4
1 9
6
2 1 7
9 2 7 5 6
5 8
2 8 3 7
4 9 2 5
3 4 8 2
Hard #8
3 6 1 5
7 3 6
4 1 7
5 2 8
5 2 4
9 1 6
6 5 3
4 9 6
1 3 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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