Printable Hard Sudoku

Set 1wu7qn1. 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
7 4 3
3 8 6 2 1
5 9 8 4
5 1 6
8 4
1 7 2 5 6
6 4
5 8 1
7 9
Hard #2
2
4 3
1 9 4 8
3 2 7 5 9
5 8 6 3
5 6 2
9 6 5
7 2 9
2 6 5 1
Hard #3
9
7 3 4
4 3 8 6 1 7
9 7 2 5 6
7 1 6 8
8 9 4 6
7 5 9
6 5 8
Hard #4
8 4 5
4
6 1
1 9 7 3 4 5 2
3 4 5 7 8
5 3
6 5
9 5 6 8
1 7 2
Hard #5
7 6 5 4 9
6 7
4
3 1
8 5 4 6 9
9 5 4
1 3 6
3 9 2
4 9 8 7 3
Hard #6
3 2 6 7 9
6 7 1 9
2
4 5 1
8 1 7
7 3 6 5
3 2 5
5 9 4
5 8 3
Hard #7
1 2 7
6 1 4
3 6 1 5 8
3 4 6
7 5 9
2 1
4 9 2
7
5 7 9 6 1 2
Hard #8
8 2 4
6 5 1 7 2
4 8 1 5
1 6 9 2
6 7 9
3 9 4 2 5
3
4
2 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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