Printable Hard Sudoku

Set 5k2o30. 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 1
9 3 2 4
4 6
2 8
4 5 3 1 7 8
5 1 9
3 4 9 6
9 5 8 2
7 4
Hard #2
1
6 3 7
8 2 4 6
4 9 6
3 7 4 8 5
8 5 1
7 6 8 5
5 2
5 3 2 8
Hard #3
1
4 5 8 9 7 6
3 9
6
7 9 8 1 2 3 4
8 3 4 6
5 8 7 9
9 2
5 6
Hard #4
8 6 7 9 1
5 6 4
9 1 2
9 6 5
5 4 1
6 1 4 3 7
7 9 4
7 5 6
1
Hard #5
3 4 9 6 2 5
9 1 3 6
2 6 5
8 7 2
3 4 9 7
1 7 3
1
1 5
5 4 9
Hard #6
6 5 8 2 1
4 2 7 6
1
1 5 6 2
8 6 5 7
4 1
5 1 7 3
6 2
7 3 4
Hard #7
2 6 8
6 1 2
7 9 1
5
3 8 9 4
4 1 7 2
1 2
3 4 1 9 6
7 3 4 5
Hard #8
6 2 5 8
5 6
4 9 7
8 5 4
9 7
1 9 5 6 3
5 2 4
3 2 5
6 7 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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