Printable Hard Sudoku

Set 1azb0sy. 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
2 8 7
9 7 6 2 8 3
8 6 5 1
5 3 2 1 9
7 4 1
5 8
8 3 5
2 9 7
Hard #2
1 4 3 2 6
7 5
3 4
7 4 1
8 1 2
4 6 5 7 8
4 1 6 3
1
6 2 4 5
Hard #3
5 7 8 4 3
8
7 9 3 2
2 3 4 7
6 5 8
8 3 1
9 6
5 2 9 4
2 1 3
Hard #4
5 6 3
9 8 5 6
1 4 2
9 3 5 1 8
7 3 9
4 7
6 5 9 1 8
2 8 7
5
Hard #5
7 8 5
9 7 3
7 9 6 3
4 8 5
9 4 3 2
6 3 5 8 4
5 6 2 1
4 1 6
Hard #6
2 6
7 6 9 8
8 1 6
9 1 2 8
2 6 7 5
3 2 1 9
5 1 3
4 3
2 6 5
Hard #7
9 1 6
7 4 2 6 3 9
6 8 3 1
5 7 1
4 1 9
5
6
8 5 7 6
9 7 5 8
Hard #8
4 8 3 6
3 6 4 2
9 6 7 2
8 4
1 2 9 7
7 9 6
9 1 5 8 7
7 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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