Printable Hard Sudoku

Set 12z9at. 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
2 1
5 4 7 2
1 8 5 3 4
6 3 4
8 7
7 5 2 6 9
9 2 7
4 6 3
5 8
Hard #2
4 7 3
8 9
9 1 4 5
1 7 6 3 8
4 5 3 9
8
6 3 1 2
4 3 1
1 6 7
Hard #3
3 5 1
4 5
9 1 4
6 4 2 9
3 4 5 1
3 1 4 8
9 6 8
4 5 7
7 3 9
Hard #4
4 7 8 3 5
5 4 2 7
2 9 6 4
1 2 7
8
6 3
4 6
4 2 8 5 9
9 5 4
Hard #5
9 3 7 8
1 5 4
8 3 9 6
5 3 1 7
8 9 3
6 2 9 1
9 7
6 7 2
2 4
Hard #6
5 4 2
6 8 9
8 3 6
6
6 7 3
7 5 8 6
9 1 8 5 3
4 8
8 1 9 5 4
Hard #7
4 8 7 2 3
3 8 5
4 1
6 7
4 1
9 6 1 5 4
1 4 9 8
5 9 8
2 1 5
Hard #8
5 2 1
4 1 6 2
7 1 9
5 3 7 8
1 6 3 5
2 8 4
6 5 2 8 7
3
9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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