Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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