Printable Hard Sudoku

Set 14hanf1. 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
5 7 8 3
8 4 1
4 5 2 9
2
3 6 5 8 1 4
8 1 4 3 9
9 3 6
6
1 2
Hard #2
6 2 8 9
7 6 8
4 7 2
4 5
9 2 3 8
3 1 7 9
2 3 5
9 4 1
1 4 3
Hard #3
7 3 4 2
4 5
4 9
6 9 8
9 5 6 2 1
7 8 5
3 4 6
1 9 4
8 7 2 3
Hard #4
4
3 4 8 2
4 2 9 1
1 7 5
7 4
9 1 2 8
6 4 3
7 3 9 2 6
2 6 5
Hard #5
9
7 1 8 6 2
2 5 7 3 4
1 9
3 1
5 1 8 6
4 6 2 5
3 7
5 8 1 6
Hard #6
3 6 5 2 8
4 2 3
9 7 5
7 6
8 2 7 1
6 5 7 1
4 1 9 8
8
3 2 7
Hard #7
3 6 4 1 5
8 5 3
7
3 1 7
9 3
4 2 3 9 6
7 2 6
6 1 2 4
1 8 5
Hard #8
5 8
1 3 6 7
6 8 3 5 9
8 4
6 5 9 3
7 4 2 6 5
6 7 3
7 9
2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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