Printable Hard Sudoku

Set 1k5cwyo. 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
5 7 1 3
3 2 9
2 7 4
6 4 8
7 6 1 2
8 1 5
7 3 9 2
1 8 4 9 7
Hard #2
7 2
3 4 9 6
8 2 3 6 7
7 6 8
2 5 9 6
3 5 1
8 2 3 5
5 4
9 8
Hard #3
5 1
5 3 6 8
8 4 9
7 6 1
2 8 7
3 1 7
2 6 8
4 8 7 3 5 2
5 4
Hard #4
3 1 9
9 3 5
9 6 2
4 7
8 3 2 1
1 7 5 3 6
6 8 4
1 7 5
9 7 1
Hard #5
2 9
3 6 7
6 8 1 3 2
9 6 8 1
8 6 5 2 9
7 5 6
3 2 9
9 5 8 4
Hard #6
2 6
9 4 1 8 2
5
7 5 6
2 3 1
7 1 8
8 9 1
4 9 1 6 2 3
3 6 7
Hard #7
7 9 5
5 4 8
4 1 2 3
6 9 2 3 7
9 8
8 1 5
7 5 1 3
8 7 4 9
6
Hard #8
9 1 7 4 5
5 8 7
4 1
7 6 9
5 6 3 4
4 3 1
3 1 2 6
1 6 7 5
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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