Printable Hard Sudoku

Set 1fk28h1. 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 7 6
8 3 5 2
9 4 2
1 2 5 7 4
5 8 7 3
7 8 9 2
9 8 5
6
1 9
Hard #2
2 7 5
8 4 2 5
9 3 1
9 6 3
3
4 2 5 7
6 5 9 3
5 1 8 7
8 9 4
Hard #3
9
4 2 1
6 7 1 3 5 9
9 8 1 3 7 2
2
4 7
8 6
9 5 1 8 2
1 5 4
Hard #4
7 8 5 4
1 4 6 5
8 3
5 3 8
6 3 9 8 5
1 2 9
5 2
7 2 1
5 6 9
Hard #5
8 9 6
3
7 3
5 1
3 9 4 5 8 7
7 9
2 6 7 8 1
6 1 5 4 2
1 5 6
Hard #6
4 9 2 3 6
6 8 1
5 7
3 6 4
4 2
6 3
8 1 7
3 2 9 6 5
9 1 7 3
Hard #7
4 8
4 7
6 5 2
8 5 7
4 6 2 9
1 5 9 4
4 3 8 5
6 5 4 1
9 2 4
Hard #8
2 7 6
1 4 2
8 7 3
8 9 2
1 8 4
2 6 3 8 9
3
3 9 7 4
7 5 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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