Printable Hard Sudoku

Set 80xwwb. 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
1 6 2 8
2 3 9
6 1 4 5
7 9 6
6
4 5 3 9
3 2 8 9
5 9 1
8 7 3
Hard #2
1 9 7 2
2 4 1
7 5
8 5 9 4 7
9 8
3 4 8
7 1 2
6 3 1
9 6 3 5
Hard #3
1 2 9 6
7 8
8 4 3 2
5 1
8 7 2 3
2 9 1
2 1 7 4
4 8 3 1 7
4
Hard #4
9 2 6
5 2 4
6 8 9
6
5 3 4
4 7 6 8 1
9 1 5 4
7 9
1 8 9 5 2
Hard #5
9 8 1 2 4
7 1 2 9
2 3
2 5 1
3 4 5 8 2
6 7
3 7 9
4
4 7 8 3
Hard #6
3 8 5 1 4
1 9 5 4 8
2 3
5 2
8 6 3
3 7 5 8
4 3
7 4 8 1
2 9
Hard #7
5 9 3 1
8 7 3
7 6
1 5
8 5 3 9
1 4 8
2 9 4 1 3
6 4 7 2
5 4
Hard #8
5 1 8 4
4 5
7 3
2 3 5 9 7
6 8 4 5
9 1
9 3 2
8 1
7 5 9 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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