Printable Hard Sudoku

Set 1u9qkv6. 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
2 5 7
4 8 9 3 2
1
3 5 4
7 5 4
3 5 6 7
1 4 7 2 9
5 2 9
3 1
Hard #2
4 5 2
8 2 1
7 8
1 4
5 7 6
6 8 9 7
5 6 9
6 1 3 8 4
8 2 9 6
Hard #3
4 5 8 1
8 1 4 3
6 8
6 3 5 8
5 9 4
6 7
7 1 3 2
5 9 6
1 8 6
Hard #4
9
6 8 1 2
7 3 4 2 6
8 5 9 4
2 1 8 6
3 6 7 9
4 2 1
7
7 2 6
Hard #5
9 5 6 8
8 1 5
4 1
3
8 2 9 4
3 6 4 5 8 9
4 7 1
2 7 9 8
2 3
Hard #6
7 3
3 9 6 2 1
5 7 8 2
4 9 6 3
7 5 9
6
8 3 2 9
2 7 9 3 5
8
Hard #7
2 3 4
8 4 6
7 8 3
9 2 3 6
9
6 5 9 2 3
8 4 7
7 3 1 9 8
7 2
Hard #8
4 8 1 2
4 7
1 7 4 8
3
3 5 7
9 1 4 8
2 5 1 9 6 3
9 5 2
7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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