Printable Hard Sudoku

Set 6itrk1. 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 1 9 7
6 4 7
5 3 6
6 3 7 2
5 3 6 4
1 9 3
4 5 2
9 1
6 9 3
Hard #2
9 5 2
1 7 9 2
3 1 6
4 1 6 7 5
9 3 1 7 8
2 4 5
3 4 2
9 3 6
Hard #3
4 9 3
1 2 9 5
7 8 9
6 2 5
2 3 4 8 7
1 6 8
4 8
5 1 6 2
4 2
Hard #4
1 6
6 1 9 8
8 4 3 5 6 7
6 7
4 5 2 1 8
4 3
7 5 8
6 2 4
3 9
Hard #5
8 9 6
5 3 8 1
2 5 9 7 4
7 3 9
9 1 4
4
6 1 7 4 5
9 3 2
5 1
Hard #6
7 6 9 5 2
2 3
5 4 6
6 2
2 9 4 1
8 1 6 7 3
1 3
9 7 5
8 7 9
Hard #7
4 8
3 5 2
7 1 2 6
8 7 6 9
6 4
7 9 1
5 7 8 3
3 2 7
6 9 1 5
Hard #8
5 7 1
3 5 4
6 4 5 8 3
8 5 6
4 1 5 3
6 4
5 6 2
1 3
6 3 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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