Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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