Printable Hard Sudoku

Set vo7rvn. 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
5 3 1 2 9
6 9 3
2 4
3 9
5 6 4 3 1
2 5
9 1
6 7 3 8
5 3 2 7
Hard #2
7 3
3 1 5 9
9 8 4
6 4 7
3 7 6 1 9
6 4
2 8 5 1
4 6 7 2
5 2
Hard #3
5 6 3 9
7 5 2
9 8 2 7
2 4 8
4 5
5 3
6 7 5
8 1 5
2 5 6 3 7
Hard #4
7
2 7 4
9 8 5 1 2
9 1 7 2
8 4 3 1
3 4 9
6 9 8
9 7 2
1 5 4
Hard #5
5 6 4 3
2 7 9 6
9
9 4 2 6
3 8 7
7 9 1
2 4 6 7
5 8 6
6 2 4
Hard #6
7 2
7 9 1 8
3 2 5
7 2 3 8 6 9
4 2 7
4
8 1 4
9 6 5 2
5 7 8
Hard #7
6 7 8 4 5
5 4 3
1 6
4 5 9
8 9 4 7 1
6 4
3 2
1 9 2 7
2 5 1
Hard #8
2 6 8 3 1
1
8 9
1 5 3 4 6
3 4 7 9 5
9 8 3
1 5 3
4 5 7
8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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