Printable Hard Sudoku

Set 1yyfiv1. 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
3 9
9 8
4 8 3
1 2
1 6 8 7 5
9 4 7 3 8
2 3 8 4
7 4
4 5 9 6
Hard #2
4 5 2
4 1
9 3 7
5 6 1 3
8 1 3
1 9 2 6
8
7 3 4 6 5 1
6 1 7
Hard #3
5 8 4
5 6
2 1 9
8 1
4 9 7 8
7 1 9 5
3 7
9 5 1 2
6 8 7 1 5
Hard #4
4 7
7 3 1
6 9
1 6 8 9
3 7 2 4
4 2 1 5 3
8 9
9 5 6
8 6 4 2
Hard #5
9
8 1 9 7 4
4 2
2 3 6 1
6 9 2 7
8 5 4
5 1 6
8 3 7 5 2
2 9
Hard #6
7 8 3 4 9
3 8 5
1 6 3
5 4 1
3 1 6 5 9
6 9 5 3
8
3 2
4 9 7
Hard #7
6 7 9
8 4 5 2
6 2
1 7 9
1 8 4 5
7 6 4 8
4 5
3 8 4 1
9 2 6
Hard #8
2 4 6 1
3 6 2 5
6 7 9 2
6 2 9
1 8 5
4 8 9 3 2
5 8
6
2 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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