Printable Hard Sudoku

Set 1nop09b. 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 5
7 2 8 1 5
9 5 4 8
6 7
2 5 8 3 9
5 7 2
1 8 5
6 9 5 2 4
Hard #2
4 5 8
4 1 6
7 3 8 4
3 6 2 5
5 3 8 9
7 2
7 9
3 9 6
7 8 2 3
Hard #3
1 3 7 9
5 1 7
5 7 2 9
7 1
5 6 1 3 9 4
6
1 6 4 3 2
3 8 6
2
Hard #4
5 3 6
8 6 4 9 2
7 5 2
8 4 5 7
7 9
1 6 2 9
8 1
5 3 2
4 3 5
Hard #5
2 4 9
5 9 7 8
7 4
6 7 2 5
1 6 9 8
5 2 3
4 5 6
8 3 6
6 1 5
Hard #6
4 3 7
3 7 8 4 1
5 2 8
5 3 9
4 8
1 9 6 4
1 8 6 5
8 4 5 7
7
Hard #7
4 1
2 6 4
3 6
3
1 7 8 5 2
7 8 6 1
3 2 8
1 7 3 4 5
6 9 4 7
Hard #8
3 4
1 5 8
7 3 9
8 2 5 6
4 5 1 9
9 6
2 3 6
6 9 2 7 5
8 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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