Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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