Printable Hard Sudoku

Set 1dthvd1. 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 4
6 4
6 4 1 7
6 8 9 2 3
7 6
3 1 6 2
7 9 5
3 9
2 5 8 6 7
Hard #2
7 3 1 5 2
4 6 1
9 3
6 1 9 7 8
8 7
9 3 4
3 5 4 9
4
1 7 2 8
Hard #3
7 2
5 1 3
1 8 6 5
4 3 8
4 8 5 9
3 9
4 7 8
6 3 9 5 7
6 9 1
Hard #4
6 2
7 4 2 1
6 5 9
3 1
2 9 5 6
3 6 2 1
9 4 3 6 7
2 3
1 3 6
Hard #5
4 3 1
2 5 9
6 3 8
9 7 2 5 6
4 6 5 8
7 4 3
8
5 8 1 6 3
2 7
Hard #6
3 4 8 2
2 3 1
2 8 9 4
7 9 6
3 6 4
1 9 4 5
3 9
5 6
2 3 8 1
Hard #7
4 5 1 9 3
5
9 2 1 7
9 8 5
1 8
1 9 6 4
6 8 2 1
9 1 3 8
2 7
Hard #8
9 3 2
6 8 9
1 5 4
1 3
9 2
8 3 6
5 2 6 4 1 9
3 9 5
8 2 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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