Printable Hard Sudoku

Set 19fwnur. 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
2 3 8
6 4 9 7
2 4
1 8 3 9 7
5 6 3
2 9 5 6
5 7 9
8 1 3
5 4
Hard #2
6 3 2
5 9
7 9 1
7 1 4 9
8 1
9 3 2
3 6
2 3 7 6
4 5 8 1 2 3
Hard #3
7 9 1 3
2 5 8 4
1 3
7 5
2 3 7 9
4
3 8 2
5 6 3 9 8
4 9 1 6
Hard #4
1 9 3 6 2
5 8 3 1 7
2 4 1
8 1
3 7 2
4 3
2 4 8
5 6 4
8 2 6
Hard #5
4 9 3 5 8
8 1
7 8 6 2
7 6 4
1 8 6 2
7 3
6 5 1
4 7
1 7 9 5
Hard #6
4 2 3 8
9 4 1 3
1 7
6 5 3
7 1
9 2 8 7
1 9 8 5
7 5 4 9
9 2
Hard #7
4 1 5 2
8 3 1
3 5 7 9
6 7 1
7 5 8
9 8 2 7
7 5 4
4 3
6 3 8
Hard #8
3
8 3 4 6
4 9 2 1
6 2 8
6 5
7 8 1 4
7 1 4
6 5 7 3
3 1 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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