Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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