Printable Hard Sudoku

Set 12xcfah. 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
7 2 9
8 2 1 3
4 8
4 2 9
3 7
7 3 1 6
5 4 8
9 1 2 8
3 9 7 6
Hard #2
8 1 4
3 7
9 5 2 8 4
4 8 3
5 8 3 2
7 9 6
6 9 2
4 1
3 4 2 7
Hard #3
7 2
9 2 3
8 4 6
5 6 4 1 7
4 9
8 1 9 5
7 3 5
5 1
4 3 5 8 6
Hard #4
4 3 1 9 8
5 6 7
1 9
4 6 2
5 4 8 6
6 1 2
9 4 7 3
6
4 9 3 2
Hard #5
6 1 5
8 7 6 3
4 8 1
2 8 7 4
8 1
3 6 8
8 1 2 9
1 6 8 4
2 6
Hard #6
9 6 1 7 2
8 6 5
8 5
5 2
8 3 4 1
7 8 1 4
6 7 4
4 9 1
6 3 9
Hard #7
2 6 7
7 4 9
3 9 5 4
5 9 7 1
1 5
8 2 9
8
5 1 4 2 6
7 5 3 8
Hard #8
7 6 4
1
6 1 3 8
9 3 4
8 1 7
3 8 9 4 5
8 5
1 4 6 2
4 7 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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