Printable Hard Sudoku

Set 1w764m1. 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
1 8 5 6
7 9 4
2 3 1
1 9
9 4
5 3 8 7
7 1 6
6 3 8 2
8 2 5 9
Hard #2
1 6 5 8 9
2 8 1
4 3 2 6
1
8 3 4
1 4 2 5
6 8 3
7 3 4 8
7 2
Hard #3
5 2 1
5 3
6 4 7 5
8 1 3 4
7 5 6
9 1
8 7 2 6 9
6 4 7
6 9 5
Hard #4
4 8 2 1 6
9 6 8 4
3 6 5 7
3 4
7 4
4 8 1
8 3 6
7 3
3 4 1 8
Hard #5
8
7 4 6 5
6 1 7
4 5
3 9 8 4
4 6 7 2 3
6 2 5
9 5 8 4
9 1 8
Hard #6
5 3
1 2 9
8 4
1 8 5 2
2 3 6 5 4 9
4 7
3 7 5
5 6 8 4
8 5 6
Hard #7
1 5 8 4
9 4 6
2 4 6 3
9 4 3 2
2 1
8 2 7
8 3 5
5 7 9 8
1 5
Hard #8
4 3 7
2 4
7 8 9 4 5
5 2 1
3 7
4 3 5
9 1 7 8
9 2 5 3
2 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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