Printable Hard Sudoku

Set 12yih3w. 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 4 5 8
1 3 9
8 4
2 8 3 1
3 5 9
5 7
8 4 3
6 7
1 3 7 4 9
Hard #2
3 2 7
1
8 3 2
3 5 1 4
5 6 4 9 8
8
6 5 2 3 8
4 8 3 9
2 6 1
Hard #3
6 1 5 9 7 8
8 2 7 6
7 2
4 6 9
3 8 4
2 1 6 4
7
2 3 1
1 6 5
Hard #4
6 3
1 5 9
8 7 1
3 4 9 6
4 7 1 2 8
4 7
5 1 2 7
7 3 1
8 6 2
Hard #5
6 4 9 8
5 1 6
1 2 9
4
7 8
3 6 2 5
5 7 6 3 2 9
4
9 5 3 2 7
Hard #6
9 5 8
8 7 4 5 6 2
7 6 3
4 7 9
4 9
9 1 6
4 8 2 9
3 6 8
7 3
Hard #7
3
7 9 6
6 8 2 1
2 6 9 7
7 3 6 5
4 7 2 8
7 4 1
9 5 7
3 7 6
Hard #8
1 5 7 6
6 2 7
7 3
1 7 4
9 2 6 3
7 1 9 8
2 3 6
6 5 7
8 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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