Printable Hard Sudoku

Set vp3o55. 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
1 6 4
3 5 2 8 7
6 1
4 7 1 3
9 6 7
6 5 4 2
9 8 7 4
5 3
2 5
Hard #2
7 4 5
6 5 4 2 3 9
9 8 7 4
1 2 5 4
9 8 3
5
9 2
1 8 2 5
7 6
Hard #3
2 1
1 5 4 9 3
4 9 7 2
4 7
7 5
2 1 6 9
9 7
5 2 1 7
4 3 8 5
Hard #4
3 1 5 4 2
3 1 8
8 6 9
5 1 7 3
8 9 3 5
7 4
6 8
8 9
5 1 2 8
Hard #5
2 1 6
9 5 3 7
3 9
8 5
2 4 7 3
4 6 2 7
5
5 1 4 6
4 2 9 3 8
Hard #6
3 2 4
4 9
9 8 4 3 7
6 8 7 9
8 1 3 5
8 1 3
5 2 6 8 9
4 9 7
Hard #7
7 8 6
4 3
5 9 8 4
9 6 7
5 3
1 6 5 4
3 6 7
1 7 2 9 4
9 5 3
Hard #8
8
2 6 3 9
7 2 6 4
2 5 6
4 9 2 1
5 7 4 6
5 9 2
7 4 3 9
1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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