Printable Hard Sudoku

Set 11sm0kx. 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
6 2 7 5 8
4 7 9
7 3
5 3 2 7 1 9
8 3 5
1 8
8 6 4
3 4 2 6
2
Hard #2
2 5
7 4 3
6 9
5 4
3 8 2 1
6 9 1 7
9 7 4 3 5
7 6 4 8
8 9 2
Hard #3
8 6 4 3
7 5 6 9
5 8 1
4 9 8 6 5 2
9 3
3 4
6 7 1 2
3 1
2 3
Hard #4
7 8 6 3
4 6 5 1
1 9
2 1 9 3 7
4 2 6
9 3
1 6 3
3 5 1 2
4 6
Hard #5
6 4 5 3 8 9
1 6 5
8 2
3 8 4
5 9 2
8 1 3
4 9 2
3 4 5
8 5 4
Hard #6
7 3 1
4 7
1 9 6 7 2
5 9 2 6
2 4 6
9 1
9 8
8 7 4 2
5 4 3 1
Hard #7
4 8 6
2 7 4
6 3 8 4
6
9 6 2 7 3
3 2 6
8 5
9 1 7 3
5 2 7 9
Hard #8
7 6 4 5
5 6 1
3 1 4 7 5 2
6 9 5
5 1 9 3
1 3 4 5 8
6
8 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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