Printable Hard Sudoku

Set 10ltpe1. 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 9 2 4
6 2 8 7
4 3
6 7 8
7 8 4
3 2 7 4 6
6 5
1 5 3 8
9 6
Hard #2
9 6 1 3 5
6 7 9 8
2
2 3
7 6 9
7 1 8
9 5 1 6
8 2 3 4
4 2 6
Hard #3
3 4 1 9 8
7 3
6 3 2
1 8
8 6 7 9 4
6 1
5 6
3 2 5 8
1 2 4 9
Hard #4
9 4 6 8
5 2
3 6 7
8 4 1 3 6
1 5 9
4 1 5 2
2 5 3
8
7 4 5 9
Hard #5
9 7 8 6
6 2 3 9 7
2 9 5
1 2 8
1 4
6 7
3 1 4 2
1 5 7
3 9 2
Hard #6
9 7 2
4 1 3
2 6 4
8 4 7
5 7 8 9 1
6
3 2 7
6 9 2
2 9 1 8 4
Hard #7
8 6 7 3 4
2 1 9
3 6 5
4
2 4 6 8 7
5 3
4 5 8 7 2
9 4 7 1
5
Hard #8
6 2 7
6 4 2
8 7
7 8
9 1 8
9 7 2 3 1
2 5
3 1 5 4 9
7 9 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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