Printable Hard Sudoku

Set 12rzx92. 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
3 6
6 5 1 2 7 3
5 9 1 4
7 2 6 1
5 8
1 4 5
1 7
2 4
5 2 3 7
Hard #2
4
4 1 6
6 5 8
1 5 8
7 9 8
2 6
7 2 8 1 5
8 5 1 9 4 2
1 3 9
Hard #3
3 4 2 6
2 1 5 8 4
8 9 5
6 5
1 4 9 6
7
6 1 8 2 3
4
4 2 7 8
Hard #4
8 2 9
3 9 6
2 5 7 4
7 8 9 5 2
4 7 1 8
3 6
3 4
6 8
9 6 8 1
Hard #5
4 8 9
9 3 5 1
7 3 2
5 4 3 7 2
6 8 9 5
3 1
3 8 1 4
9 8 1
1
Hard #6
1 3 4 6
4 8
5 8 9 6 1
5 3 7
5 7 9 3 4
2 7 6 1
9 1
7 1 4 2
Hard #7
1 4 9 8 2 5
9 4 6
8
1
8 5
5 9 2 8 1
4 7 2 9
8 2 5 9
8 6 3
Hard #8
8
4 2 1
9 7 3 4
1 5 2
6 9 4 5
8 7 3
3 5 8 1
1 6 3
8 6 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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