Printable Hard Sudoku

Set nbvsa0. 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 5
1 4 3 6 9
5 9 7 8 2
2 6 5
8 2 7 1
4 7
5
7 8 1
6 1 4 3
Hard #2
1 8 2
8 2 5
7 9 3
4 3 8 6 1
1 7 4
6 2 9
6 3 5
9 3 1 8
4 9
Hard #3
6 5 7
4 1 8
8 9 6 4 3
8 5 6
5 7 3 9
6 3 1 8
5
8 1
2 4 9 3
Hard #4
4 2 7
7 8 4 3 1
6 3 4 2
1 8
7 5 3 1
5 2 8 6
8 3 6 4 2
7 9
Hard #5
7 2 1
8 1 7 3 5
3 6 8 2
4 1
2 9 5 8
6 4
9 8
8 2 7
4 3 1 5
Hard #6
2 1 8
6 2 3 8 5
4 8 7 6
9 5 3 2
4 6
7 8 4
9 7
8 6 5
1 2 7
Hard #7
7 2 1 8 5
6 3 1 8
2
6 2 9 7 4
9 4 2 6
7 5
7 9
3 8 4
4 5 3
Hard #8
5 2 3 1
6 7 1 5 3
4 8
7
7 2 8 9 3
3 6 2 4
8 6
4 1 8
4 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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