Printable Hard Sudoku

Set zpfbx1. 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 7 1 8
4 3
3 8 4 2 6
1
8 5 4
7 8 3 2
7 4 9
2 9 1 4 8
5 1
Hard #2
4 3 7
7 2 5
3 2 6 8
4 5 8 6
9 2 7
3 8
5 1 9
8 3 1 6
3 2 9
Hard #3
4 7
2 4 7
7 9 8 5 1
1 5
7 3 5
6 9
1 9 7 8
5 8 6 1
6 1 4 3
Hard #4
3 7
2 4 8 5 1
1 4 6 7 5
2 8 5 6 1
5 1
6 3
2 9
1 6 4
7 4 8
Hard #5
4 8 7 3 6
5 7
1 2 8
8 1 6 9
9 5 4
2 6 7
1 7 2 8
9 6 4
3 6
Hard #6
7 6 8 1 9
2
5 3 4
1 8 7
2 9 8 3
9 7 1
6 3
5 6 1
1 2 6 5 4
Hard #7
5 2 1 6
7 8
3 4 9
3 1 9
3 4 1 8
5 7
2 8 3 6
5 6 1
6 7 8 4
Hard #8
8 6
3 4 6
2 9 5 3 8 7
9 7
7 2 3 1
5 2 3
8 7 4 5
8 6 3
3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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