Printable Hard Sudoku

Set 12gfd3q. 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
1 5 4
9 5 3 2
8 1
3 2 6 5 1
5 8 7
6 5 2
6 2
3 7 5 4
5 8 2
Hard #2
7 6 1 5
4 9 6 3
8 4 7 6 1
4 2
5 6 3
8
2 5 1 4
4 3 2 6
7 5
Hard #3
4 1 5 9
3 4
3 9 1
7 8 2 1
6 3 5
2 6 7 9 8
5 6 9 8
8 7 2 6
Hard #4
9 7
8 2 5
6 1 9 7 8
4 7 1 8
5 2
7 3 9
5 1 7 9
4 1 2
3 5 4
Hard #5
8 9 4 2
2 1
4 9 7 6
2 7 1 5
7 4 8 3
5
4 6
3 9 4 7 2
8 3 4
Hard #6
1 2 7
8 2 9 5
3 7
9 3
7 8 4 5 1
1 2 9
6 9
2 5 6 8
1 3 9 5
Hard #7
1 2 9
8 3 1
7 2
2 8 7 4
8 4 5 2
6
3 8 5
9 4 2 8
5 1 3 8 6
Hard #8
9 2 1 6
7
5 2 8 1
9 6 1 5
1 7 8 9 2
6 4 7
2 4
8 5 3
3 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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