Printable Hard Sudoku

Set 12vh2v5. 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 2 8
1
2 5 4 6 7
5 4 3 8
6 4
3 8 7 4
4 6 3
6 3 4 2
2 6 5
Hard #2
6 9 3 7
4
7 3
8 5 2 6
3 4
7 4 8 5 1
5 4 6
3 1 2 9
6 1 4 2
Hard #3
2 5 6 4 1
4 5 8
4 9 1 2
9 4
1 2 6 3
3 6 7
6 1
4 7 3 8 2 6
Hard #4
9 7
1 4 8 9
6
7 1 5
1 4 5 8 3
2 7 9
4 7 6 9
6 5 2 7 1
8 4
Hard #5
3
3 2 1 4
8 3 1 9
5 3 1
8 4 2
6 3 9 2
4 1 6
8 5
9 2 1 3 8
Hard #6
2 6 4 9
9 8 3
7 5 8 6
7 5 2 6
1 9 4
1
3 2 6
6 2 9
8 6 3 7
Hard #7
6 4 9 1
8 3 6
3 2
4 6 8 2
5 8 1 7
9 5
9 8
7 5
8 3 6 2 5 4
Hard #8
7 5 8
4 3 2
5 8 2 3 1
8 6
5 1 2 4
9 4 1
3 6 7 9
2 4 9
1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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