Printable Hard Sudoku

Set 1kk8j2o. 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
6 9 7 8 1
5
3 9 8
2 3
8 1 3 9 2
5 3 9 4
2 4 1 9
1 4 6
7 8
Hard #2
8 5 9
3 2 5 6
4 9 7
4 7 5 3 2
3 1 2
5 7 8
9 4 5
5 3
1 5 7
Hard #3
9 5 1 4
4 5 2 8 9
9
7 8 3 5 2
2 5 4 7
9
5 7 9
1 8
8 4 2 9
Hard #4
4 8 1 2
7 3 8 5
5 4 7
2 3 7 6
9 1
4 7 1
2 6 7
5 9 3 8
1 5
Hard #5
7 5 6
6 8 4
9 3 8
3 2
2 5 4 1
4 1 8
7 2 8 1
3 9 7 5
2 5 8
Hard #6
2
8 9 7
2 1 8 5
3 2 5
4 9
6 5 7 1 3 8
8 1 3 7
4 1 9
3 2 4
Hard #7
3 2 1
1 6
5 4 3 2
5
9 2
5 6 7 3
7 1 5 9 8 6
4 6 7
8 6 5 9
Hard #8
6 7 5
6 9
7 1 9 5
8 6 7
3 1
1 3 6 8
5 8 2
5 3 1 4
9 4 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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