Printable Hard Sudoku

Set 7u9m47. 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
9 3 6 4 5
4 9
8 6 2 7 9 5
7 5 8 2
4 6 7
8 9 3 7
7 2 5 6
1
Hard #2
6 4 3 2
8 9 4 6 3
2
3 6 2
2 5 9
3 2 1 7
4 2 7 9
4 5 6
7 9
Hard #3
2 5 4
7 9 2 4 5
5 8 2
1 7
9 4
7 3 6 2 1
9 1 7 8
2 8 9 3
6
Hard #4
2 3 6 5 7
7 9
7 1 2
6 7 9
7 4 3
8 3 7
1 8 5 6
8 2
3 4 1 8
Hard #5
9 8 6
1 9 4
1 6
1 7 6 4 8
9 8 1
6 5 3 7
4 6 5 3
2 7
5 6 9
Hard #6
7 4
6 7 2 8
5 3 2 1
1 4 9 2 5
8 7
2 4 8 1
3 7
7 8 5
1 9 6
Hard #7
3
7 4 5
4 5 6 9
3 1 4
4 7
6 2 7 8
5 7 2
7 8 4 9 5
8 6 9 1
Hard #8
2 7 9
6 9 1 8
5 8 6 7
6
7 3 5 1 4
4 7 3
2 1 6
3 6 4
2 3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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