Printable Hard Sudoku

Set 13d0ja7. 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 8 1
4 6 9 2 5
3 7 8 9 5 6
6 2 7 4
2 4 1
8 5 3
9 1 5 2
Hard #2
4 5 2
9 1 4
3 8 5
4 8 7
3 1 6 2
2 7 8 9
5 2 3 1
4 5
4 9 1
Hard #3
7 4 8 2
9 1 6 8
2 1 5
3 9 4 1
5 3
2 4 9
1 9 6
5 2 9
3 8 7
Hard #4
8
6 9 2 7 5 3
1 5 9 6 7
9 7
3 5
3 4 1 2
4 6 9
6 9 5 4
9 2
Hard #5
4 3 2
3 6 8 1
8 6 1
6 9
5 9 2 1
2 7 5 3
4 9 1 2
5 6 2
7 9
Hard #6
1 8 2 4
6
7 6 2
6 9 5 2
9 7 2 8 1
7 5
6 1 3 9
1 2 4
2 3 9
Hard #7
3 1 4 7 9
5 3
6 2 4 1
1 9 7
7 9
7 5 6 8 4
2 7
3 1 9
8 4 5
Hard #8
4 3 5 9 6 8 2
8 9 1
7 9 4
8 2 9
5 4 2 1
3
3
1 8
6 2 7 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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