Printable Hard Sudoku

Set 1x4jwn1. 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
9 1
8 4 9 6
8 5
7 2 3 6 9
1 7 5 2
4 1 2 5
6 3
8 3
2 7 9 4
Hard #2
8 4 1 5
2 4
7 8 5 9 6
1 9 5 4
4
1 3
3 8 9 5 6 1
1 8 6
5 8
Hard #3
2
5 8 1 9
7 2 4
8 5 9
7 8 6 5 2
2 7
4 1 9 2
5 6 1
3 1 4 6
Hard #4
4 2 7
4 1 9
3 9 5 8 7 6
8 6 5 1
6 3 9
7 8
2 1 7
3 4
8 3 1
Hard #5
2
5 1 7 3
7 1 6
6 3
3 9 6 4
8 1 2
5 2 3 4
4 2 7
5 7 4 6 1
Hard #6
9 7 6
5 8
7 1 2
5 7 8 4 1
8 7
1 6 5 3 9 8
3 4 9 8
6 1
9 1
Hard #7
3 4 6 2
2 3 1 9
5 7 4
3 8 5
6 7 9 4
4 1 7
1 6 7
9 8 2 5
1
Hard #8
1 4 9 3
5 2 7
7 1 8
7 8
4 2
8 3 7 5 4 9
3 9 7
6 3
4 2 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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