Printable Hard Sudoku

Set iztxy1. 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 8 3 4
5 1 7
4 8 9
1 9
2 7 8
3 2
3 8 5 4 2
1 8
5 6 7 2 3
Hard #2
7 6
3 4 5 2
8 7 3
1 8 2
9 6
9 2 6 7 3
3 2 8 9
2 5
7 1 4 3
Hard #3
3 4 7 2
6 3
3 9 4
2 4 9 7 8
3 7 2 9
9 5 8
2 3
5 6 1 2
3 7
Hard #4
7 2 4
9 8
1 5 8
5 7 3 9
3 4 8 9 2 1
9 8 7
1 7 3
3 2
6 8 1
Hard #5
6
8 1 7 3
5 9 8
3 7 2
7 4 8 6 5
2 7
3 5 1 2
7 9 5
6 5 4 9
Hard #6
4 1 8 3
6 3
5 4
2 6 9 3 4 8
5 2 3 1
5 3 4 2 9
9 6
4 1 2
3
Hard #7
8 6 4 3
2 1 9
3 7 2 5
9 2
5 3
6 5 7 4
9 7 6 1 5
1 4
7 2 3
Hard #8
5
4 1 3 5
3 1 7 2 4
1 2 9 4
5 2 7
6 5
1 9
9 3 2
3 6 4 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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