Printable Hard Sudoku

Set v3cboi. 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
7 3 9
9
8 6 2 3 1
9 8 5 4
2 1 8
5 4 6 3
1 9
8 2 7 1
3 8 7
Hard #2
6 7 3 8
3 5
7 8
5 8 4 6
9 8 5 2
3 6 5 9 4
7 4
6 4 3 2 7
5
Hard #3
6 9 5
2 8 6 3
7 5 3 2
7 2 5
4 9
4 5 1 9
8 1
9 6
5 8 4 1 3
Hard #4
8 5 2 3
7 9
2 7 8
5 9 3 6
9 6
3 6 2 9 1
2 1 6 7
4 7 3 8
4
Hard #5
1 2 5 9 4 3
9 8
7 8
5 6 2
4 8 3 2
3 9 7 4 6 5
8 3 1
5 7
4
Hard #6
7 9 8 5 3
8 9 2 7
5
4 3
2 1 8 4 6 7
7 1 5
9 1
7 4
3 6 1 7
Hard #7
7 6 9 5 4
8 6
6 3 2
3 4 9
9 5 3 7 6
7 6 8
3 6 7
8 3
2 7 9
Hard #8
1 6 7
9 2 8 5
4 2 8
7 1
5 4 6 2
7 1 3 4
2 3 5 6
4 3
6 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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