Printable Hard Sudoku

Set 6f6sds. 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 4 9
3 5
9 1 8 2
8 6 2
9 1 2
3 9 6 5 1 4
6 1
3 4
4 5 2 6
Hard #2
3 8 2
2 3 4 1
4 6
3 8 5 1
4 2 6 7 3
5 9
6 9 3 5
9 6
3 7 4
Hard #3
6 8
5 8 4 2
3 7 5
8 6 3
6 2 1 9
3 2
7 4 1 5
9 5 8 3
1 3 4
Hard #4
9 4
7 5
2 3 9 5
4 2 6 9
3 9 5
2 1 8 3
5 4 9 2 1
8 1 4
3 9
Hard #5
5 6
4 8 6 9
9 3 4
4 5 3 1
9 1 6
1 7 8
7 3 8
4 2
8 1 4 9 7
Hard #6
8 7
4 8 1
4 9 5
3 4 8 6 9
2 7 1
5
6 9 3
7 5 9 1 3 2
5 7 4
Hard #7
5
9 4 6 7 1
7 3 8 4
2 4 6 8
2
5 3 6 7 1
9 1 3
7 2 8 6
5 2
Hard #8
3 4 8 1
1 6 3 8 2
6 9 3 4 7 2
3
2 1 7 6
4 2 5
6 3 9
8 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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