Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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