Printable Hard Sudoku

Set atd6s1. 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
8 7 5
2 6 4
6 9 8
2 6 1 5
4 6
8 1 5 7 9
5 9 6 1
7 8
1 6 3
Hard #2
2 1 9
9 7 8 1 3
5 7 9 3
5 6
4 5 7
3 2 4 1
9 8
4 5 9 3
6 2
Hard #3
3 9 7 2 5
1 8 3
8
2 5 9 7
7 5
6 4 3 5
7 9 2 8 6
4 6 5 3
1
Hard #4
5 2 4 9
9 7 5 2
3 7
9 7
7 2 4 8 5 6
3 8
8 3 7 2
1 6 7
1 4
Hard #5
8 2 7
3 8 2
6 7 3
2 8 5
9 1 5 2
6 2 1 4
2
4 1 6 7 9
3 4 2
Hard #6
6 2 4 1
2 7 3 8
9 5 2
6 9 1 7
2 5
2
6 3 4
9 8 1
4 5 6 2 7
Hard #7
2 6 9 5
1 5 3 2
7 2
3 2 1
5 2 9 7
9 8 7
9 7 8
7 2 1
3 8 4
Hard #8
3 9 8 7
5
6 1 4 8
6 8 5 3
9 1
4 5 3 2 6
4 2
1 5 9
2 9 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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