Printable Hard Sudoku

Set 1hcki92. 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 3 1
8 5 2 4 9
6 9 8 2
3 6 4
7 8 5 1
5 6
1 2 6 7
6 7 8 4
Hard #2
3 8 4 6
5 7 3
1 8 7
8 1 6
7 2 8 9 4
6 9 1
5 4
9 5 2 3 7
3
Hard #3
5 1 8 3 2
7
3 1
6 5 1
1 5
4 2 1 6 8 3
9 7 1
3 4 8 9
6 2 3
Hard #4
4 7 5 6
6 7 8
5 7
1 2 6 8 3
6 1 5
8 2 7
1
4 3 6 9
5 3 7 1
Hard #5
4 6 8
2 4 1 6
7 6 5 3
1
3 9 7 4
8 4 3
1 8 5
9 5 6 1
3 5 9
Hard #6
2 9 4
7 8
6 8 5 4 3 7
2 6 1
5 6 4
8 5 9
9 1 7 4
7 4 5 6
5
Hard #7
2 4 5 8
1 5 7
3 8 1
9 6 3
7 4 3
4 5 9 2
1 6
7 6 9 4
3 5 7
Hard #8
8 9 5 6 2
8
2 7 6 3
2 5 3
7 9
1 9 7 2 4
8 1
5 2 4 3
2 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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