Printable Hard Sudoku

Set vio2ei. 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
5 7 2 6 3
6 4 5 3
3 9
6 7 1
6 9 2
3 1 6 5 9
9 7 3
4 3 1
Hard #2
6 9 7 3 8
9
9 3 6
7 6 8
9 5 1 3
3
1 6 2 8 7 5
7 6 1
4 5 7
Hard #3
7 5 3 4
6 7
3 9 8
4 1 3
4 7 9
8
6 4 9 2
8 4 5 6
1 3 4 7 9
Hard #4
1 2
2 9 8 5 4
5 8 3
1 7 5 4 6
4 9 7
9
6 1 2 7 8
9 6
5 4 7
Hard #5
9 3 2 6 7
5 8
1 3
2 9 1
3 9 7
8 2 9 4 3
2 5 3 7
5
6 5 4 2
Hard #6
2 6 3 7
9 2 8 5
4 1 6 8 3
1 5 4
4 6
3 9 7 6 1
6 8 2 1 9
3
Hard #7
4 3 7
8 9 7
1 8 4 5
3 8 2 6
1 7
2 9 8
9 1
6 4 5 3
6 9 7 1
Hard #8
6 8 7
9 2 5
4 1
4 7 6 2
3 7 6 2 8
1 4 3
6
3 1
1 5 9 6 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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