Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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