Printable Hard Sudoku

Set 9u4k5e. 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 3 1
6 1 8 9
1 2 4 6
9 3 4 2
1 2 9
6 8
9 3 5
4 3 7
5 6 4
Hard #2
1 2
6 1 3 4
5 2 8 7 1
2 8 4 9 1
3 4
7 9
6 5 3
4 3 6
6 8 2
Hard #3
4 2 8
6 2
7 8 9 1 5
5 9 6
9 8 6 5 7
6 2 1
3 7 9
1 3 5
6 8
Hard #4
7
4 6 3 7 9 1
2 9 7 5
9 5
3 8 1
6 5 4 3 8
6 1 2
4 8
6 7 1
Hard #5
5 9 6
5 2 8
9 3 7 5
8 4 9 2
5 8 3 6
1 3 6 4
4 8 7 5
3 2
1
Hard #6
6 4 8 7 2
7 6
9 3
5 2 6 7
4 3 5 9
1 8 2
7 8 5 4 9
6 2
5 8
Hard #7
3 8 9
7 2 6 1
1 9 5
9 4 8
1 4 2
2 1 8 7
4 3 7 2
2 6
9 5 4
Hard #8
7 6
2 5 4
6 7 1 5
9 8 6 3 2
4 5 2 1
7 8 4
5 1 7
6
2 9 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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