Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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