Printable Hard Sudoku

Set 1nu99nn. 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 6
4 8 6 9
9 3 4
4 5 3 1
9 1 6
1 7 8
7 3 8
4 2
8 1 4 9 7
Hard #2
8 7
4 8 1
4 9 5
3 4 8 6 9
2 7 1
5
6 9 3
7 5 9 1 3 2
5 7 4
Hard #3
5
9 4 6 7 1
7 3 8 4
2 4 6 8
2
5 3 6 7 1
9 1 3
7 2 8 6
5 2
Hard #4
3 4 8 1
1 6 3 8 2
6 9 3 4 7 2
3
2 1 7 6
4 2 5
6 3 9
8 9 4
Hard #5
4 9 5 3 8 6
8 6 1 9 3
6 4 9 3
2 1 4 7
5 9 2
9 6
2 1 7 9
5
Hard #6
5 4 8
6 8 4 9
6 5 9
8 2 9 4 6
7 2 4
1 2
6 2 7
7 3
7 1 9 6
Hard #7
5 1
9 1 3 5
8 4 5
7 6
3 2 1 7
7 1 5 9
5 4 2
6 5 9 8 3
1 7
Hard #8
4 5 9 2
6 8 7 5 3
8 1 6 9
2 3 6
9 3 7
5 3 4 8
3 8 1 2
1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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