Printable Hard Sudoku

Set xbn1oa. 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 5
2 4
5 8 4 2
6 9 4
3 2
3 7 5 8 6 9
2 9
2 5 9 6
1 9 3 2
Hard #2
5 7 9
6 4 8
9 3 4 5
4 9 3 8
1 3 4
8 7
6 4 5 1
8 6 2
7 2 3
Hard #3
5 7 8
3 1 2 9
4 1 5
7 3 6 2
5 1 8 3 4
2 9
3 6
1 2
8 4 9 6
Hard #4
3 1 2
2 8 4
6 4 2 9 5 7
9 2 8 4
9 7 2
7
7 5 1
8 6 5
4 8 3
Hard #5
7
2 3 9 6 4 8
4 5
9 2 4 3 6
3 1 6
6 1 4
8 3 4 1 7
2 6 5 8
Hard #6
5 2 6 3 4
8 1 5
4 3 1
9 8 3
8 9 6
4 1
5 7 9 4
6 2
2 3 8 9
Hard #7
5 1 4 9
1 8 7 5
6 2
5 2 9 3 8
7 4 5
4 2 7
6 3
9 5 2 3
7 3
Hard #8
3
3 5 2
1 9 3 6
1 3 7 4
6 2 4
7 3 5 6
5 8 9
8 4 3
9 4 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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