Printable Hard Sudoku

Set n2xozo. 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
5 3 1
2 8 4
4 6 2 8
2 1 9 8
8 5 2 7
9 6
4 7 8 6
6 2
4 1 7
Hard #2
5 1 7
9 6 5
2 6
9 4 6
6 5 4 3 1
3 2 5 4 7
8 1 3 6 4
9
4 2
Hard #3
7 6 4 9
6 5 4 7
9 8 3
9 8
8 2 3
4 2 9
7 1
2 3 5
5 9 3 6 7
Hard #4
7 8
6 3 9
2 3 1 5
8 4 9 1
2 9 5 6
3 4
5 9 7
3 7 4 8 9
6 3
Hard #5
6 3
9 4
8 9 4 7
1 6 2
5 8 9 1
3 7 4
9 5 8 6
8 7 6 3 1
2 7
Hard #6
8 5 9 6
1 5 9 8
7 2 3
5 2 8
4 6 1 3
5 1 9
5 8
5 1 6
7 8 4
Hard #7
5 1 3
8 4 9 5 1
1 4
5 3
7 3 6 4 5
4 7
9 3 2 1
1 8
2 7 9 6
Hard #8
9 7 4 6
2 9 5
8 4 9
6 1
1 8
5 7 9
5 1 4
9 8 2 6 7
8 5 4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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