Printable Hard Sudoku

Set 1760ok1. 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 8 9 4 1
2 8
6 4 2
7 2 1
8
7 6 5
7 6 8
8 7 5 4
9 6 1 2 8
Hard #2
4
6 3 4 7
1 7 5 3
3 2 1
7 6 1 4 9
7 2
5 3 8 6
5 4 8 2
1 5
Hard #3
2
8 9 7 1
9 6 5 7 4
2 6
3 1 2
5 8
3 6 1 4 9
2 5 8 6 1
4 5
Hard #4
9 5
2 8 9
8 4 2
6 4 7 3 2
1
1 5 6 4
4 7 6 8
2 9 1
9 8 5 3
Hard #5
3 6 8
2 6 1 3
9 1 8 5
7 5 6 3
2 5 7
6 1 9 2 4
5
6 1 2 9
3
Hard #6
8 2 5 6
9 8
5 2 3
4 1
7 5 1
1 5 7 4
4 1
9 5 6 8
3 5 6 4 7
Hard #7
1 4
3 9 6
6 7 1 3
4 1 7
8 2 3 5
5 9 3 1 6 7
5
5 4
2 6 3 7
Hard #8
7 2
7 2 1 4
1 5 6
1 4 2 5 7
5 1
2 4 9
5 6 4 3 7 1
7 5 6
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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