Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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