Printable Hard Sudoku

Set 1sf7fk1. 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
9 7 3
4
6 9 3 2
3 1 4 2
5 6 8
5 9
5 2
1 9 5 8
5 8 7 3 9 1
Hard #2
7 3
8 6 4 7
9 3 4
5 9
3 4 2
6 4 2 8
4 6
1 6 9 8
9 7 2 3 1
Hard #3
1 4
4 6 9
7 5 6
3 8 2 9
4 9 2 6
8 5 6 3
1 4
3 6 1 8
9 3 1
Hard #4
2 4 7 1 5
2
8 1 2 6 7
7 3
5 6 2 3
1
2 9 4 3 6
1 4 8
8 6 5
Hard #5
5 7 3 8 9
8 5
4 7 6 2
9 6 8 3 5
5 3 8
5 2
8 2 4 7
7 1 5 2
Hard #6
3 4
1 8 7 3 5
4
7 3 9 8
3 5 6
1 4
2 3 7 6 1
7 4 3
6 5 2 7
Hard #7
3
5 2 9 6
9 3
5 8 4 9 6 2
1 4 9
9 6 5 8
2 1 6 9
5
8 4 7 5
Hard #8
9 4
7 2 8 9 1
4 6
2 5 3 9 1
8 1 5 9
8 3 4
9 3 4 7
6 7 8
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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