Printable Hard Sudoku

Set 1lec67y. 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
9 6
3 9 2 4
4 5 6
5 1 8 2 3
9 7 1 2 5
8 9
3 1 8
7 9 3 6
Hard #2
5 4 3 1 6
9 7 4
2 7 6 5
3 1 8
7 2 6 3
9
6 7
4 1 9
3 5 2 7
Hard #3
6 4
7 9 6
2 3 8
8 7 5
1 5 6
8 2 6 9 3
2 4 8
9 5 1
8 5 3 9
Hard #4
6 2 3 1 9
1 2 8 6
8 9 4 7
3
1
5 6
3 4 5 8
6 5 7 4 2
8 6 5
Hard #5
9 2 5 8
8 5
4 7 2
7 9 6 3
8 4
3 6 7
8 5 9 2
2 6 7 3
9 8 4
Hard #6
7 2
5 2
6 8 1 2 9
4 8 1
4 5
1 5 3 6 4
3 2 5
9 5 7
6 5 9 3
Hard #7
2 3 5 1 7
4 5
9 1 4 3 8
8 4 9 2
3 4 7 1
2
8 2 9 4
1 7 6
3
Hard #8
3 9
4 8
9 7 5 3
4 1 2
1 8 7 9
2 9 3
3 8
9 5 8 7
6 2 8 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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