Printable Hard Sudoku

Set c6a99g. 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
3 7 6 4
1 4
8 2 1 7
5 2 4 7 9 3
9 3
1 8 7
4 1 5 3 8
1 9
4
Hard #2
4 7 9 3
2 9 1
7 6 2
7 8 9 2 3
3 1 2 7
5 2 8
8 6
9 1
5 1 4
Hard #3
5 2 8
6 4 9 7 2
4 9
3 4 9 5
1 5 3 9
2 9 8
4 2
7 8 5 3
5 2
Hard #4
8 9 1
6 1 8
7 3 6
2 8 1 3
6 2
9 5 4
1 8 6 7
2 6 5 7
3 7 4
Hard #5
5 9
1 2 6
7 8 3
4 6
9
6 4 3 1
2 5 1 4 3
4 3 9 7 6 5
6 3 4
Hard #6
7 2 6
6 3 7 4
3 8
8 3
4 6 1
8 6 7 3
5 1 7
6 1 4 5 9
9 8 1
Hard #7
4 8 6 2
3 2 1 6 7 8
8 9 1
2 4 9
2 5
4 1 6
9 8 1 5
5 1
9 3
Hard #8
3 1 2
8 2
4 9 6 7
2 5 7 4 3
9 1 3
7 6 4
5 9 6 3
5 9
6 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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