Printable Hard Sudoku

Set 12f9bwn. 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
4 5
3 7
4 2 5 1 8
6 7 3
8 4 2
8 9 3 1 7
9 6 5 8 4
8 5 2
1
Hard #2
1 5 3 9
4 1 5 2
4 8 9
4
2 3 8 1
5 9 7 3
1 9 5
8 6 4
6 7 2
Hard #3
9 7
3 8 4 6
3 1
8 6 1 4
4 3 1
1 6 5
1 2 5
9 8
2 5 9 6 1 4
Hard #4
4 6 7 5 8
8 7 1
9
5 8 9 7 2
4 7 5
3 9 2 6 4
1 7
7
5 1 6 8
Hard #5
4 1 5 2
9 1 6 4
7 8
4 2 6 5
5 4 2 3
1 9 7
6 9 3 8
9
9 5 2
Hard #6
5 6 3 7 8
3
8 5 7 4 1
9
2 8 9 4
7 9 1 5
6 1 2 3
3 8
7 5 4
Hard #7
8 1 5 6
6 7
7 5 8 2 3
2 5 8 4 6
9 7
5 8
3 2 4
8 4 7 2
2 3
Hard #8
8 6 3
1 8
7 3
3 7 8 2
2 9 1
9 6 7
9 4
5 8 4 2 3
9 2 7 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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