Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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