Printable Hard Sudoku

Set 1ok44k. 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
7 1 9
7 2 6
1 2 7
7 9 2 4
4 5 6 9
6 8
8 4 5 7 1
5 9
3 7 6
Hard #2
1 9 6 4
3 1 5
8 4
2 9 3 1 4
9 8 2 6 3 5
1
2 3 6
5 4 9
9 3
Hard #3
4 6 8
8 1
5 1 3 7 6 2
7 9 2
9 5 4 3
8 3
6 7
7 4 2 1
5 3 9
Hard #4
9 5
9 4 8
8 9 3
8 7
6 8
2 4 3 1
3 2 4 7 8
2 6 5 1
6 8 3 2
Hard #5
2 9 6 7
3 4 5
5 9 8 3
8 3 2 7 9
5 6 7
6 3 8
9 8 1 5
5
3 4
Hard #6
9
5 9 7 4
3
6 8 1
1 6
2 9 7 4 3 6 5
8 1 6
5 6 4
7 8 4 3 9
Hard #7
2 7 8 5
8 6
5 1 4
5 6 2
3 7 2 6
2 5 1 3
3 2
4 7 1 2
8 9 4
Hard #8
2 7
7 6 5 8
1 5 4
6 2 9
3 4 1
5 6 2
8 5 6 3 9
2 4 5
7 4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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