Printable Hard Sudoku

Set 13lcnby. 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 9 4
4 2 6
6 7 2
3 4 2 8 5
3
5 8 6 9
6 3 8 9 1
5 8 6
7 3
Hard #2
4 5
3 7 1
1 7 6 5 3
2 6 1 3
8 4
6
8 9 6
2 8 9 5 7
7 4 5 1
Hard #3
6
8 5 7
5 8 1 6 3
4
9 3 2
6 7 5 4
9 6 3 1 2
4 1 7 6
2 5 8
Hard #4
8 6 7 5
3 1 5 4
1 7 3
7 2 1
4 6
2 3 1 4
8
9 6
4 3 6 9 8 2
Hard #5
8 6 2 9
2 4 1 7
8 3
7 2 4 6
1 3 8
2 8 5 6
7
7 9 2 4
7 9 6
Hard #6
7 5 2 3 1
6 7 2
8 9 4
5 9 1
3 1 4
5 7 6
6 3 1 7 9
3 5
4 5
Hard #7
2 6 1
9 4 8 3
6 4
9 3 7
7 9
7 1
6 2 4 9 7 1
5 4
8 2 6 5 7
Hard #8
4
5 2
8 5 3
4 7 8 5 1
1 9 7 6 5
8 3 9 7
5 6 9 3 8
4
3 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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