Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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