Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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