Printable Hard Sudoku

Set vhrc0g. 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
6 8 1 3
1 8 4 9 2
5
7 2 3 5 8
6 4
4 3 2
7 8 3 6
6 1 7 5 4
Hard #2
4 6
5 8 6
7 1 3
2 8 4
4 9 7 5
3 5 1 9 8
3 1 9
1 2 3 7 4
1
Hard #3
9 7 2 3 4
1 4 6
6 7 5
4
1 3 2
7 2 8 5 6
7 2 9
3 8 9 7 5
1
Hard #4
8 4 7 9
3 1
2
9 3
3 6 7 8 4
5 8 9
7 4 3
4 1 6
2 3 5 4 7 8
Hard #5
1 8 6 3
4
4 3 8 9 1
7 5 6
9 8 2
6 2 4 3
4 7 1
2
3 7 5 1 4
Hard #6
7 2 6
3 4 7
9 5 8 2 4
6 2 1 4
5 9 6
8 2
1 9 7 3
1
7 5 1 9
Hard #7
8 9 3
4 8 6
2 1
4 9 2
6 8 7
9 8 6 4 1
8 3 9 6
9 3 6 8
4 2
Hard #8
7 1
9 4 5 8
8 2 5 1 6
5 4 1 9
8 5
3 2 4
6 4 9
4 7 3
1 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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