Printable Hard Sudoku

Set vg94l1. 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 9 1 2
2 5 7
8 9 7 5
6 2 1
4 5 8 6
6 3 5 2 4
1 6 3
3 1
Hard #2
3 8 5
5 3 4
1 2 6
2 7 6 1 9
9 6 3
6 5 1 2
3 7 4
8
4 3 2 8
Hard #3
7 2 1
5
8 4 6
5 7 3 8
6 8 7 9
4 7 9 6
4 1
3 2 6
1 8 5 3 2
Hard #4
8 3
4 3 7 5
6 1 5 4
6 1 9 8
4 5 2
1 2 4
9 4 3
8 7 6
3 8 1
Hard #5
5 3 8 1 6
4 5 3 2 7
7
2 9 7
8 3 9
3 5 4
4 2
7 8 1
3 7 2 5
Hard #6
9 5
2 5 7 1 4
7 1 2 3 9 8
7 3
8 7 3 9
4 9 7
6 4
1 5
5 6 1
Hard #7
8 7 2 4
4 1 9
2
8 2 1 3 7
9 7 5 1
6 5 9 2
2 6 5
2 6 8
5 4
Hard #8
6 3
7 5 9 8
8 9 2
9 3 1
2 6 9 7
8 1 5
3 8 7 2
2 4 6
6 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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