Printable Hard Sudoku

Set v709a1. 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 1 2 7
5 2 9
8 9 3 6
3 9 4 8
5 6 1
5 9
8 3 7
7 1 9
4 9 2
Hard #2
5 8 1 4
2 7
6 9 3
8 3 9
6 4 8 1
3
6
2 5 4 9 8 6
8 9 2 6 7
Hard #3
7 6 1
1 5 3 7 6 8
8 2 4
9 4 5 1 3 2
3 2 6
2 9
8
5 2 4
7 1
Hard #4
7 8 6 9
3 9 7 4
1 5 2
4 9
3 2 8 4
3 2 4 1
8 1 3 7
5 7
6 3
Hard #5
3 6 5 8
8 9
9 7 5
5 2 6 1
1 3
2 5 8
9 6 5 3
7 2 8
1 8 3 9
Hard #6
9 5 6 1
8 2 6
7 3 2
5 1
7 6 3
1 5 9
5 8 9 4
9 1 3
2 6 7 8
Hard #7
2
1 9 3
8 4 3 1 7 6
9 8 1 7
2 4
4 7 3
4 3 8
5 1 9
1 6 2 5
Hard #8
7 3 8 5
5 4 8
2 9
8 1 7 6 2
9 5 1 7
3 6
6 4 3 7
1 4 7
5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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