Printable Hard Sudoku

Set 14pycdn. 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 2 4
9 7 3 5 6
4 2 5 1
9 4
5 3 2 9 4
6
2 1 3 8
4 1 9
6 3
Hard #2
1 7 6
2 3 8
6 8 5
1 9 8 6 5
2 7 8
5 6 7
1 8 2 3 5 4
9 7
2
Hard #3
1 3 8 2
6
4 6 1 2 8
8 7
3 7 6 1
5 3 8
7 3 5 9
9 8 7
2 7 9
Hard #4
8 4 3
4 3 6 9 7
1 2 4
1 7
2 5 8 9
4 6 3
9 2 6 8
1
7 3 6 9
Hard #5
3 1 6
8 4 7 9 2 6
2 1 9
9
6 5 8
9 2 3 1
7 8 6 5 9
3 5 8
3
Hard #6
5 3
9 1 6 8
7 8 4
6 2 1
9 7
3 8 7 2
9 6 4 5
1 4 9 6
7 8 4
Hard #7
8 3 7 5
1 4 7
2 3
6 1 9 8
2 8 7 1 4
4 1 3 5
2 3 8
5 8
6 1
Hard #8
3 8 2
9 2 5 6 8 4 3
3 7
2 9 4
5 8
3 8 6 1
6 7 9 5
5 1 2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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