Printable Hard Sudoku

Set 1a35yq1. 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
3 5 1 6
1
8 4 3
3 4 7 1 8
9
4 7 6 5 2
9 2 7 5
7 5
5 3 2 9
Hard #2
6 1 4 9
2 3 8
7 5 8 6
5 8 2
3 9 4 2 1
9 4 6 2 3
1 5 7
4 2
Hard #3
2 9 1
7 1 4 2 6
9 4 5
4 5 1 7 3
6
8 1 7 5
6 7
8 9 6 1
3 8
Hard #4
1 9 8
7 8 4 5
2 4 6 1 9
3 5 4
6 9 2
4 8 5
8 9 6
7 1 2
5 3
Hard #5
6 9 8 3
2 8 9
7 6
8 5 4 3 7 9
5 8 1
1 8 6 7 3
4 7 1 8 5
5
Hard #6
1 4
7 3 2 5
8 5 1 6
4 6
3 2 5 9
7 6 8 2 4
3 7 9
4 1
2 8 4
Hard #7
3 2
1 8 6 5
2 7 6
8 6 4 9
7 9 5 8 6
5 1 4
9 6
2 6 1 9
8 1
Hard #8
3 8 1 4
3 9
4 5 2
7 6 5
8 1 7 6
5 2 4 9
3 4 7
8 1
1 5 4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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