Printable Hard Sudoku

Set 1xor1ka. 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
4 6 8 3
8 3 4 6 2
5 3 7 9 2
5 6
3 9 4 1
4 3
5 1
2 9 1
Hard #2
1
5 2 6 1 7
7 6 9 3
3 6 2
4 3 5
5 8 9 4
9 8 5 3
6 4
1 6 7
Hard #3
5 8 3
2
5 3 1 9 6
5 3 7
7 8 5 4
9 2 5 1
1 5 2 8
6 4
2 7 1
Hard #4
8 5 6
2 3 8 7
1 5 4
9 7 3
2 4 6
1 3 4 8
6 1
5 1 7
3 7 5 2
Hard #5
9
8 3
9 7 4 2 1 8
2 9 3 1 6
6 3
1 3 4 5
5 7
9 5
7 5 4 2 8
Hard #6
7 3 9 8 4
2 9 4 7
4 6 8 9
6 8 2
4 9 7 2
3
4 1
9 5
7 6 3 9
Hard #7
7 4
2 3 5 8 9
6 3 5
5 6 9 4 7
3 9
2 6 8
7 5 3 4
7 4 1
8 6
Hard #8
3 5
3 9 2 4 7
7 1 4
5 3
9 1 2
8 2 9 5
8 5 1 3 9 2
7
6 2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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