Printable Hard Sudoku

Set ocm92t. 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 1 8
2 4
7 9 3
4 9
9 5 8
7 3 4 2 5
1 3 8 9
6 4
8 3 7 9 1
Hard #2
1 8 7
7 5 1
2 8 4 6
9 2 7 4
9 1
7 4 1 8
4
8 5 1 9 2
5 3 4
Hard #3
1 7
5
9 1 8 4 6 2
6 3 7 9 1
8 1 7 3
5 4
8 2 5 7
2 3 9
7 3
Hard #4
4 8
6 3 5
9 7 2 4 6
3 7 4 1
2 9
5 6 9 7
8 5
9 6 1 3
5 2 7
Hard #5
5 7
9 3 7 2
1 2 4
9 8 7 4
6 2
6 2
4 2 3 6
5 1
8 3 5 1 4 9
Hard #6
6 8
8 3 2
9 4 7
5 3 7
8 1 6
7 9 2 4
7 4
8 2 7 5
9 5 2 6 3
Hard #7
6 5 4 1
2
9 2 3 5
9 3
3 4 2 7 6
1 8 6 2
4 6 5 1
7 6
5 8 4
Hard #8
6 8 5
8 2 7
1 4 9
3
8 6 2 5
1 5 4 7 8
7 6 4 8
6 4
2 8 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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