Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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