Printable Hard Sudoku

Set mzj6q0. 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 4
6 8 5 2
3 1 8 9 6
7 3
6 9 2
9 7 1 4
2 5
7 4 9
5 2 6 7
Hard #2
8
5 2 4
7 8 4 6 3
7 1 3
5 3 2 6
2 3 5 7
6 4 9
8 3 7
4 9 3
Hard #3
9 2 7
7 1
3 4 6
7 8
4 5 8 1 9
5 4 6 8
7 6 3 2
1 2 4 3 5
2
Hard #4
5 1 7 3 4
2
6 4 5
9 5 8
8 1 2 5
2 8 7
7 9 3
6 3
4 5 6 1 7
Hard #5
5 1 8
6 3 4
6 1 7 5
1 5 8
4 6 1 5 9
9 2 1
5 4 3
2 9 3 6
7
Hard #6
9 4 2
5 4 1 8
8 4 6
6 1 3 8 7
5 3
9 7 1 2 5
8 3 4 7
8
2 3
Hard #7
1 5 7
7 4 6 8
8 9 5 3 4
9 3
7 2 8
8 4
1 7
8 3 2
2 5 6 8 4
Hard #8
5 7 4 8 2
8 4 9 1 5 3
2 9
7 2 6 1
7
8 4
4 9 6
1 6 2 4
3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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