Printable Hard Sudoku

Set 1m97wv1. 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
6 9 2
7 1
5 8 6
1 4
4 7 3 6
9 6 8
9 6 4 7 2
5 9 2 4 6
7 3
Hard #2
6 1 5 7
5 3 9
3 2 4 5 1
3 2 4 1
6 8 3
5 4
9 3 2
6 8 7
1 6
Hard #3
8 5 4
3 2
8 1 2
5 3 2
6 8 1
4 9 8
2 5 3 8
3 1 5 9
7 1 9 2
Hard #4
2 5 7 8
5 7 1
7 2 5
4 3 7 9
9 3 2
2 7 6 4
4 9 8 5
6 1
9 4
Hard #5
1 9 2
5 7 9 6 3
5 6
7 9 1
9 6 7
7 3 9
4 3 1
5 2 3 9
1 9 7
Hard #6
4 3 6
7 6 9
8 3 2 5
5 8 3 7
9 3 1 4
5
6 9
7 4 9 3 5 8
7 2
Hard #7
2 3 6 4
6 3 1
7 5 9 2 6
2 4 3
8 9
4 5 1
8 2 4
3 5 1 6 9 8
Hard #8
5 2 6 3
7 2
4 5
5 8
8 3 4 6
5 1 2 6
6 9 7
1 2 6 7 4 5
3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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