Printable Hard Sudoku

Set vleg7i. 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 7
3 2
5 8 1 9
5 6 2 7
3 1 4 9 8
8 9 2 6
1 5
9 3
2 1 9 6
Hard #2
3 7 1 6
2 7 5
8 9
8 1 4 2
4 2 9 8 1
7 1 6
3
6 9 2
6 7 8 5
Hard #3
7 4 3
5 8 7
3 1 8 9
6 2 5 7
1 4 2
8 4 5
5 4 1
7 5 9
7 3 9
Hard #4
7 2 3
2 3 9
4 2
7 8 3
9 5
1 8 7 6
5 3 1 6 4
4 8 5 9
4 2 9
Hard #5
5 8 2 9
2 1 8
7 8 3 5
1 8
9 5 1
3 1 6 4
6 1 3
4 8 6 7
2 4
Hard #6
3 7 6
1 9 5 4
9 2 8
1 8
9 6 1 4
6 7 8 9
5 6 2
6 8 3 9
7 6
Hard #7
8 1 6
4 2 7 3 5
1 3 7 2
5 9 7
9 6
1 5
7 5 4 2
4 9 1
5 2 3
Hard #8
6 2 4 7 8 9 5
4 5 3
5 8
4 2 9 7
5 3 2
1
7 5 3
2 7
9 6 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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