Printable Hard Sudoku

Set 91cc63. 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
3 6 4 9 8
9 7
5 7 3 2 4
3 8 4
7 2
5 8 3
5 6
9 3 1 5 6
2 9
Hard #2
3 8
5 6
7 6 4
9 7
8 2 5 4 3 9
7 4 1 6
4 9 1 2
7 8 4
1 2 5
Hard #3
5 2 7 6
9 8 3
1 7
2 7
2 6 3 9 4
4 7 5 1 6
2 1 7 5 3
5 4 8
Hard #4
9 4 8 3
2 7
5 7 3 8
9 2 4 6
8
2 6 5 7 8
3 6 5
1 6
5 4 7 9
Hard #5
7 9 3 5
5 2 8
8 3 1 7
2 7
9 4 8
3 6 1
4 7
5 4 2 3 6
9 6 8
Hard #6
6 3 1 2
5 1 7
8 6
9 8 7
6 5 7 4
7 9 6 3
3 8 6
2 1 9 4 8
5
Hard #7
1 9 8 7 6
2 4 7 8
7 2 3
4 9
9 5 8 4
6 3 8
9 2 5 1
2
3 9 7
Hard #8
9 8
8 5 9 4
2 7 5
3 8 7 6 2
6 8 7
3 4 5
7 6 3 9
3 5 7
8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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