Printable Hard Sudoku

Set ff64jk. 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 2 7
4 5 9 6 7 1
1 9 8 5 6 4
1 6
7 4 2 5
8
4 6
2 3 9
8 7
Hard #2
4 2 1 8
6 3 8 7 1 4
6 5
3 2
5 8
9 1 8 2
4 8
5 1
2 5 4 9 6
Hard #3
9 8 5 1
1 4 7 9
2 6 8
2 1 5 3
6 3 2
2 4 9
1 7 3
8
3 5 7 6
Hard #4
1 7 5 3 2
8 6
3 2 6 7 4
3 2
6 7 5
4 9
2 7 4 6
1 5 8
8 3 2
Hard #5
2 1 6
7 5 3 9
4 8 7
9 4 7 2
8 9 3
1 3 7
9 5 6
1 2
6 2 4 7
Hard #6
2 6
9 2
5 4 6 2 3
3 2 7 4
8 4 1
2 3 6
7 8 5 4
8 1 3 5
6 9
Hard #7
5 6 4 7
1 9 5
4 2
8 3 4 1
4 8 9
9 7 5
1 2 3
3 8 5 6
6 4 1
Hard #8
1 7 9 5 3
4 3
2 5 7 8
4 5 2
3 8 1
2 8 3 6
2 7 9 8
6 4
3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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