Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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