Printable Hard Sudoku

Set 13amt7v. 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
9 3
7 8 1
3 4 6 8
4 5 3
8 6 1 7
5 2
8 9 6
6 9 1 2
5 4 8 9
Hard #2
9 2 1 8 3
9
8 1 2
4 9 3 8 5
5 4 3
7 3 6
3 5
1 9 8 6 2
7 4
Hard #3
8 5 4
4 1 7 3 5 2
3 9
7 1 8 6
9
1 9 2 8
3 9 6
7 6 5 2
6 7
Hard #4
4 1 3 9 5
2 9
6
3 4
4 7 2
9 6 7 8
8 9 4 7
7 5 6 1 2
3 6 7
Hard #5
2 4 3 9 8
8 9 2 4
2 4 5 7 1
3 5
7 8
8 3 4 6
7 2 1
4 1 6 5
Hard #6
1 9
1 3 9 4
5 6 3 2 1
6 9 5 2
8 3
2 1
3 2
4 1 7 5
6 8 2 4
Hard #7
5 7 4 1
8 9 3 6
9
4 9 8 2
6 4 7 8
2 1
9 2 5
5 6 3 4
6 7 1
Hard #8
7 8 4 6
1 8
7 2
4 1
2 4 3 9 5
8 9 1 3
7 5 6 9
2 9
5 7 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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