Printable Hard Sudoku

Set 167ev58. 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 6 2
4 6 5 1 8
5 1 9
7 4 6
2 3 6 7
8 4
6 4 9
1 7 2 4
9 1
Hard #2
6 1 5 7 8 4
7 1 6 8
3
8 5 2 9
4 9 3
2 7 6
1 8
5 9
7 1 9 2
Hard #3
8 7 5
2 5 3 4
9
5 6 1 8
5 9 7 2 4
6 5 2
4
3 6 8 9
7 2 3 6
Hard #4
6
8 2 7 6 4 9
7 3 9 1 8
1 8 5 4 9
7 3 2
8
2 8 1
5 4 3
4 5
Hard #5
2 5 9
8 5 3
3 6 1 4
6 8
3 8 6 2
7 2 4 9 3
2 8
2 5 6
9 7 1
Hard #6
7
8 4 3 5
3 9 8
7 8 1 3
7
6 9 4 5
6 1 5 2 4 9
4 3
4 9 6 7
Hard #7
9 3
2 8 1 7
5 6 8
2 9 5 4 1 6
1 2 8 7
7
4 1 9 5 6
5
8 9 7
Hard #8
5 3
8 9
8 1 7
3 2
4 8 6 5
3 1 5 6 8
2 7 5 9 4
8 3 9 6
7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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