Printable Hard Sudoku

Set c0pzx7. 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
4 2 8 3
1 5 6 4
3 5
6
4 7 8
1 5 8 7
7 5 3 4 6
3 1 6 9
2 3
Hard #2
3 5 6
8 2 7
5
8 9
9 4 8 3
2 8 6 5
7 2 8 3 6 1
6 1 3
3 2 1
Hard #3
4 3 9
2 4
9 7 1 6 4
3 6 5
7 9 3
5 4 8 7
5 1
6 8 2 1
8 7 9
Hard #4
8 7 1 6
3 7
4 1 2 9
5 4 7 2 1
9
6 7 5 3 2
6 1 4 7 3
8 9 5
Hard #5
9 6 1
2
8 7 6 9
7 5 9 2 3
4 9
4 7 6 5
9 2 6 3 8 4
4
1 9 7
Hard #6
2 1 6
9 2 3
4
2 9 7 1
1 9 6 2 5
4 7 9
8 2 3
6 1 5 7 9
8 1
Hard #7
7 5 8 4
8 5 3
4 6 1 8
5 8 3 9 4
9 3 2 6
3
1 6 8
6 2 1
4 2
Hard #8
7 9 4 3
9 7 1
4 8 3 2
7 2 1 6
2
1 5 6 8
7 4 5
5 4 1 9
2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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