Printable Hard Sudoku

Set 12wj5ws. 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 8 4 1 5 7 2
6 3
3 7 4
7 2
7 2 9 3 5
4 6
1 3
8 9
2 6 1 5
Hard #2
3 2 5 9
6 8 1
4 5
6 2 7
9 5 1 2 6
4 2 8
8 3 7 4
3 7 6 9
1
Hard #3
5 8 1
8
1 4 6
7
6 7 3 4 1
7 1 9 2
2 9 5
5 7 4 3 6
8 3 6 2
Hard #4
9 3
4 9 6 5
5 1 2
1 5 2 8
7 6 1
8 5
9 6 1 7
2 1 6
2 4 8 9
Hard #5
2 9 8
3 6 1
3 5 7 6
7 3 6 2
8 5 6
9 7 8
6 9 3 7 8 2
4 5 3
Hard #6
8 7 6
2 1 3
5 8
5
6 9 1 7 2 5
1 8 9
8 2 6 1
3 9 4 6
9 5 7
Hard #7
6
3 6 9 5
8 7 3
6 8 5 9 1
1 2
3 2 9 8 6
7 5 4
8 5 3 9
3 2
Hard #8
8 3 1 6 9
2
5 3
3 4 6 7
5 8 9 6
9 2 7 3
1
9 4 6 1
8 2 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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