Printable Hard Sudoku

Set 1kc90cb. 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
8 1 6 7
7 3
8 6 9
3 8 9 7 5
5 4 6 2 7
5 4
8 5 1
9 4 2
7 9
Hard #2
2 1 4
8 7 6 1 3
9 1 3 2
6 4
3 6
2 7 3
7 4 9 8
5 7 2
2 8 4
Hard #3
6 9 2
5 1 6
8 3 6 9
2 4 5 8
1 9 6
6 3 2
1 8 3 7
3 5 4
7 2
Hard #4
2 6 4
9 5 7
6
5 6 1
8 2 4 3
2 9 1 7
5 8 1
6 1 9 2 4
9 1 3
Hard #5
7 1 6
7 4 3 8
4 2 1
7 4
2 3 7
9 6 8
9 1 8 4 2
6 2
8 3 7 6
Hard #6
6 8 3
2 9 7 4
4 9 8 7
5 6
8 9 5 6 2
3 4 2 5
4 5 3
2 8 7 5
Hard #7
7 2 4
6 9 5
8 7 4
3 6 1
8 5 1 4 3
6 7 8 4
8 3 2
3 6
9 7 8
Hard #8
2
4 6 5 1
7 5 8
2 7 4
1 5 7
9 7 6 3
9
6 3 8 7 2 5
2 5 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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