Printable Hard Sudoku

Set 13co9qg. 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 6 4 5 7
9 4 2 1
2 5 9 3
7 6 9
8 3 7
6 4 7
6 3
9 8
5 9 8
Hard #2
7 1 8
1 7 3
4 7 2
7 8 5 4
7
2 7 5
2 3 9 4
9 5 7 3 6
5 1 9
Hard #3
4 8 5 1
5 3 2 6
6 3 2 4 9
9 2 7
4 1
3 5 4
6 3 1
8 7
3 2 4
Hard #4
4 3 8 5
5 9 6 2 3
6 2
2 9 7
8 2
5 6 8
8 7 1 2
4 8 5
6 7 3
Hard #5
5 7 9 3
2 4 6
9 6 3 4
3 5 6
7 9 1 8 5
4 2
5 1 9
3
8 1 5 2
Hard #6
8 2 9
5 3 9 8
7
3 5 2 8 9
8 7 1 2
3 6
4 6 5 7
5 9
6 7 5 8
Hard #7
8 5 1
2 5 4 3 7
8 4 5
2 4 7
9 6 8 3
1 5 7 9
5 1 8
9 1 8
6
Hard #8
2 5 8 3
3 5 6
2 6 5 8 4 9
7 8 5
3 7
4 9
1 4
5 3 2 7
9 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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