Printable Hard Sudoku

Set q3bo7h. 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
7
2 4 7 1
1 4 7 8 6
8 5
6 8 5 3 1
6 7
9 5 1 3
5 2 4
6 9 7
Hard #2
5 9 3 1
6
7 9 6
9 7 2 8
7 6 1 8
4 9 2
5 1
5 7 6 4
1 4 6 2
Hard #3
4 7 5 8
7 1 2 4 6
9 7 1
6 3
9 8 5
2 1 7 8
8 7
2 6 5
2 5 6
Hard #4
1
9 5 2 7 4
5
4 1 3
9 6
1 4 7 5 8
1 2 3 9 8
6 4 1
5 4 6 1
Hard #5
4 7 9 1 2
3 2 1 7
4
9 1
8 3 7 5 6
3 5
3 8
5 9 8 4 2
6 3 5
Hard #6
3 7 6 8
7 4 8 1
1 6 7 4
9 7 2
1
4 8 6 9
6 2
9 8 6 5
3 4 8
Hard #7
5 7 4
5 4 6
8 9 3 2
6 8 3
7 9 2 6 5
2 1
8 1
2 4 9 7 5
5 6
Hard #8
2 4
4 9 2 7
7 3 8 6 9 2
6 7 3 9
5 2
9 1 4 6
4 8
6 3
2 7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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