Printable Hard Sudoku

Set 1niwav1. 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
8 6 4
9 4 6
5 2 9 8
3 4 5 9
8 3 5
4 5 1 7
9 6
8 2 7
4 8 7
Hard #2
4 8
7 2 5 6
9 8 4 2
1 4 9 5
3 9
7 2 1
4 7 6
5 7 1
2 5 6 8
Hard #3
5 2 1 3
4 7 5
9 1
1 6 5 2
2 4 9 5
5 4 3
3 8 7
8 7 9 4
2 1
Hard #4
9 2 7
7 8 5
8 7 5 3
2 4 9
5 9 4
6 8 7
1 4 2
3 1 5 8
2 6 7
Hard #5
3 6
3 9 8 7 1
8 1 3
1 6 7 5 2
2 9
4 1 9 3
8 4 6
2 9
6 1 4
Hard #6
1 7 4 9
6 9 1 2
2 4 6
3 8 2
2 1
4 8 3 5
9 8
6 5 3
5 1 2 6
Hard #7
5 8 2 3 4
3 1 9
1 9 5 4 7
2 4 3
7 1 2
2 3 5 9
4 8 6
2 1 7
Hard #8
9 6
5 8
7 4 9 3 2
7 5 9
3 2 5
9 1
3 4 8
5 2 9 7 1
1 3 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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