Printable Hard Sudoku

Set hmdp34. 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 6 1
6 5 7 8
2 4 8 7 3
8 2 7 3
9 4 7 8
1 9 7
3 6
1 6
7 9
Hard #2
4 5 3
1 2 8 7
5 9 8 3
9 4 6
1 4 7
3 4 2 9
3 1 2 8
5 6
4 5
Hard #3
5 2 3
2 4 7
1 2
3 2 4
8 7 3 6
9 1 7 4
5 3 2 9
9 4 1 7
2 8
Hard #4
2 7 3
8 9
9 5 1 2
4 9 5 1
1 7 9
2 6
6 3 1
8 6 4
2 4 8 9 3
Hard #5
9 6 2 4
2 6
3 9 1 2
7 3 4 8
5 3
6 4 7
4 8 5 7
4 3 2 8
7 5
Hard #6
7 5
1 6 8
9 3 8 6
1 4 2 6 9 3
8 4 9
5 6
7 8 9 1 6
3 2
7 5
Hard #7
7 4 6 1
6 7
6 1 2 9
9 4 8 2
1 3 9
2 7 8 9 6
6 5
3 9
8 1 4
Hard #8
8 7 6 2 1 9
2 1 4 5
4 5 2 3
1 6 3 2
5
7 8
5 7
3 7 1
2 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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