Printable Hard Sudoku

Set 7940. 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 8 1
2 3 4
7 4 5 2 6
1 9 5 3 7
6 7 8
5
9 5 1
7 5 4
4 9 2
Hard #2
1 7 3 5
4 5 7 3
2 7 1 5 4
7 4
5 2 8
8 1
5
9 4 2 3 6
7 6 4
Hard #3
5 1 3
2 4
1 4 6 3 8
5 2 7
3 1 7 5
6 3 8
8
6 4 9 5
1 9 5 6
Hard #4
2 4 5
3 8 4 7
7 8
7 2 5 4
5 4 9 3
1 4
7 2
5 7 1 9
9 5 3 4
Hard #5
5 6
4 2 7
3 9
3 2 6 1
7 8 9
4 2
3 1 7 5 4
6 7 8
9 8 1 2 5
Hard #6
5 9 8 3
7 3 4 1
8 4 6
5 9
3 2 1
5 4 7
4 9 8
2 8 3 7 4
1 3
Hard #7
5 7 4 1
8 3
9 7 3 8
2 7 9 3
4 2
5 7 8 6 1
8 2 6 3
1
9 4 3
Hard #8
9 1 2
9 7 4 8
1 3 4 9
3 6 1 2
9 5
5 8 4
5 6
8 7 4 9 1
7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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