Printable Hard Sudoku

Set 12sq6xm. 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 1 8 9
5 4 6
8 9 1
7 6 1
2 8 4 9
5
9 6 4 3 2 1
7 6 8 4 3
Hard #2
4 3
8 1 5
8 3 2 6
8 4 9
9 4 5
3 2 4
4 9 8 2 7 3
7 9 4
2 5
Hard #3
9 6 3
3 2 8
1 7 5
7 9
8 5 7
9 4 1 6
3 7 8
2 1 6 8
4 7 1 2
Hard #4
1 9 2
7 3
3 1 5
1 9 4 7
5 4 2 8
8 7 6 9
1 2 7 6
7 3
8 6 4
Hard #5
2 7 9
5 3
7 8 1
3 5 7 8 1
1 4
7 5 2
1 7 3
6 7 9
9 2 3 7 8
Hard #6
8
1 9 3 4
7 3 1 6
6 2 7 9
7 1 8 6
2 1
5 8 6
4 7 2 3
1 7 2
Hard #7
7 4 9 1
4 3 8 6
5 7 6
9 6 1 7 3
1 3 4
3 6
7 3
3 4 8
2 1 4
Hard #8
4 1 5 9
6 3
9 2 7 6 4 8
7 2 6 3
5 6 1
9 3 5
1 4 9 3
3 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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