Printable Hard Sudoku

Set 1ec2kak. 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 4 3
4 8
3 6 2
6 5 1
7 8 1
2 8 5 6
7 8 5 1
4 8
2 9 6 7
Hard #2
1 7
3 5
2 9
2 9 6
6 2 7 8 4
7 3 4 2 1
5 1
6 8 1 3 5
9 7 8
Hard #3
5 7 3
2 5 9
5 3 8 6
6 7 2 4 5 9
1
9 8 6
4 2 1
7 3
7 5 4 1
Hard #4
4 2 9
1 3 2
9 1 7 8
7 2 3 9
4 3 6 2
6 3 8
7 2
6 3 7
1 4 5
Hard #5
6 2 7 4
8 5 6
9 8
7 2
9 1 4
4 5 9 6
6 3 4
3 2 5 8
2 7 3 1
Hard #6
2 1
1 6 2 4
7 4 2 3 8
2
1 9 5
3 6 4 7
4 6 8 7
5 7 4 1
8 5
Hard #7
3 8 1
6 1 4 2
7 6 3
7 9
8 4 6
1 8 3 9
6 2 1 7 4
1 4
4 8 9
Hard #8
4 1 3 5
6
8 2 6 9
4 6 3
1
3 7 2 5 9 6 1
5 1 4 9
2 4
4 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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