Printable Hard Sudoku

Set 12p1wwk. 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 5 2
6
3 4 8 9 7
5 4
9 6 3
2 7 8 1
8 1
5 9 1 6
3 7 5 2 9
Hard #2
3 5 6 2 8
5 3 6
8 6 9 4
2 6 3 5
2 1
6 5
3 9 7
7 8 1
8 9 4
Hard #3
8 7 3 9 2
6 8 4 3
3 1
9 7 5
8
8 4 1 7
1 6 2
4 9 7
3 8 5 2
Hard #4
4 7 9
8 7 6 4 3 5
2 1 6
9 2
1 6
7 3
5 1 6 8
2 1
6 1 3 5 9
Hard #5
8 9 2 7
4 7 5
2 4 5 8 1
8
3 7 1 9
2 8 5 1 4
9
5 8
3 7 4 2
Hard #6
9 5 6
5 2 1 4 7
3 2
7 5 9 1
9 6
6 7
9 8 6 4
8 3 1
1 5 4 2
Hard #7
5 4 1 3 9
6 2
1 9 8
7 6 9 5
3 5 8 1 6
8 3
2
9 8 6 5
3 4 6
Hard #8
2 3
7 8
5 7 4 1
9 1
8 6 4 5
3 5 6
6 5 8
1 7 4 2
3 6 2 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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