Printable Hard Sudoku

Set 11mlfg9. 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
3 8 5 4
6 5 7 3
7 1 9 2
8 9 6
3 9
7 6 1
8 6 1
2 8 7
5 7 3
Hard #2
9 6
6 5 7 1
1 8 2
7 3 5 8
3
4 9 2 6
5 9 8
6 3 5 2
8 6 1 4
Hard #3
2 8
7
6 3
1 2 6
1 9 2
8 7 4 6 1
6 8 7 3 5
3 7 8 9
4 9 3 7
Hard #4
8 4 7 1
4 9 3
2 1 3 6
3 5 8 6
7 4 8
9 1
1 9 7 8
2 5
1 2 4
Hard #5
6 4 9 1
7 8 5
6 3 9
4 9 2
2 7 6
8 2 3 7
1 9 2
4 6
6 3 8 2
Hard #6
3 6 7
1 4 5
1 4 3
3 6
3 2 5
9 5 8 6 7
9 8 5 7
3 7 1 8
2 6
Hard #7
6 9 3 1
4
3 7 5 9 2
3 2 1
2 8 9
3 9 4
2 4 1 5
5 1 8 3
4 6
Hard #8
5 2 4 6
4 5 1
8 5 4 7 9
2 8 4
6 4 2 7
3 6 8
8 4 6
4 5
9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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