Printable Hard Sudoku

Set 1a6i9x1. 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
6 8
5 6 4
9 8
2 4 6 5 9
3 2 1
7 8 5 6
3 2 7 9
8 1 3 4 5
Hard #2
9 3 4 2 1 7
6 8 3
4
4 1 7
6 2 9 8
9 3 4 2
8 9 1
5 3 2 8
8
Hard #3
4 9 2 6
9 2 5
6 1
8 6 1
6 7 3 4
1 5 4 9
1 5
9 4 8 7
8 7 3
Hard #4
5 7 2 4 3
5 9 7
1 7 2
2 9 7
5 6
7 5 1 8
9 2 8 3 7
7
1 4 3
Hard #5
1 2 7
4 9 2
9 4 7 8 3
4 3 8
3 6
7 1 5
9 2 6
1 3 6 5 8
8 9
Hard #6
5 2
8 9 6 7
7 2 1
1 8 4 6 2
3 1
7 5 8
3 6 9 4
8 4 7
1 9 5
Hard #7
3 9 7 4
6
8 2 5
2 1 7 3 9
9 6 2 7 1
4 6
3 2
2 9 3
5 7 9 8
Hard #8
8 6 2 5
1 4 7
8 9
2 8
1 5 8 4
4 8 9 6 2
7 6 3 9 5
9
1 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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