Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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