Printable Hard Sudoku

Set 11znjas. 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
6 7 1
5 9 2 3
8 9
4 1 2 6 3
8 1
9 7 4
2 1 5 4
7 3 9 6
5 7
Hard #2
8 7 6 1
2 1 3
1 7 3 9
4 8
6 4 1 5
3
7 6 4
9 1
4 3 8 5 9 7
Hard #3
3 7
8 9 6 3
6 7 9
8 2 3
4 5 6
7 4
6 4 3 8 5
8 5 7
3 2 6 8
Hard #4
7 4 5 6 9
6
5 9 6 3 1
7 6 4
1 5 8 4 2
6 7
7 2
8 4 3 5
2 9
Hard #5
7 5 3
4 7 9
3 9 6 2
6 3 4
1 7 4
6 7
9 2 3 6 7
7 6 8 2
3 5
Hard #6
4 2
3 6 5 1
6 7 2 3
5 8 3
3 8 9
2 5 4
1 4 2
2 3 9
6 8 7 3
Hard #7
8 5 4 7
9 8 2
6 9 3
2 5 4 1
9
6 8 5
7 5 8
6 1 2 7
6 5 4 9
Hard #8
6 2 5
2 5 9 8 1
9 8 1 4
4 8 5
6 4 3
1 5
6 7
8 2 7 6
5 8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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