Printable Hard Sudoku

Set 1wd749m. 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
3 4 6
5 7
4 1 9 2
7 5 9 8
8 3 1 2
6 1 3 5
3 9 7
7 5 1
8 6
Hard #2
8 2 7
9 5 1 4 8 3
4 8 6 5
4 9 2
1 6
4 3
7
6 2 3 7
8 2 3 4
Hard #3
5 9
2 8
5 1 2 3
6 8 4
8 9 5 6
7 5 1 4 3
3
1 7 6 8
4 9 6 1
Hard #4
1 3
2
8 6 4
8 2 7 4
2 9 6 5 3
9 4 7 1
8 7 1 6
6 5 4
8 4 3
Hard #5
3 4 9 7
2 7
8 6 5
2
7 9 3 6
4 1 5 8
6 1 3 9
3 5 8 4
9 5 3
Hard #6
1 6 8
6 3 5 4
8 9 2 6
9 6
6 8 5 3
5 7 1 8
7
9 1 7
2 4 5 9
Hard #7
2 5 1
4 7 6
6 3 1 7
1 5 7 3 9
9 8 6
3 2 4
3 1 2 4
1 4
2 7
Hard #8
1 9 3 4
4 8 7
7 9 3 2 5
6 3 8 1
8 2
7 1 9
8 1 2
4 6
3 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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