Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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