Printable Hard Sudoku

Set nb55uc. 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
9 6 3
7
8 5 1 7 9 4
2 7
9 6 1
3 8 2
5 1 2
7 4 1 9 8
8 2 4
Hard #2
3 5 9
2 4 6
5 4
8 7 9
7 4 5 1 8
9 6 3 5 7
2 8
1 2 5
7 3 8
Hard #3
6 1 5 9
8 7
8 3
4 2 1
9 4
2 3 4 6
1 7 5
7 9 6 1
4 3 2 1 9
Hard #4
8 3 7 6
5 1 4
6 9 1
2 3 1 9 7
8
7 9 6
2 4
5 3 8 9
8 5 2 6
Hard #5
8
8 2 6 3 5 7
7 6 3
1 5 6 8
3 4
3 7 4
7 8 2
6 2 3 8 1
2 6
Hard #6
1 5 4 7
9 8 6
8 3
6 3
3 4 5 1
4 2 5 1 7
5 1 4 8
8 4
4 1 9
Hard #7
8 5 1
3 8 7
7 9 6 2 4 5
5 1
8 1 3 4
1 3 8
6 2 7 9 8
3 6 2
Hard #8
1
8 6 5 2 9
9 8 7
3 4 7 1
8 9 3 6
7 9 5 8
6 5 8 1
9 1
1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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