Printable Hard Sudoku

Set 1q64crf. 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
9 7 2 1
2 1 7 4
5 3
6 4 2
7 8 1
5 6 3 8
6 3
8 9 5
1 4 2 6
Hard #2
9 5 6 7
6 4 9 5 2
8 7
3 5 8
6 9 1
6 5
7 8 2 1 5
6 9 2
1 6
Hard #3
5 7 6 4
1 3
7 1
3 7 8 2 5 1
6 3 9
4
8 1 7
1 4 8 2
2 9 6 5
Hard #4
5 2 7 3
3 4 9
6 7 1 3 5
8 2 7 1
6 9
6 1 8 7 3
4 5 8
5 6 3
Hard #5
8 3
2 7 8 9
1 9 2 3
4 1 8
3 6 7 1
7 9 2
9 7 1 8 5
1 4 2 7
Hard #6
1 2 6
8 3
6 2 8 5
4 7
7 8 5
8 6 4 1
9 6 8 7
2 1 5 4
1 3 8
Hard #7
3 8
6 3 9 4 7
7 2
2 8 1 9
6 4 5 2
5 1
6 8 7
8 3 6 9
7 4 5
Hard #8
6
4 6 7 1 8
1 6 3 7
1 2 9
5 4 9
3 2 7
5 9 4
2 7 3 5
4 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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