Printable Hard Sudoku

Set an5190. 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
8 5 2 6
1 4 6 7
4
9 2 4
6 5 8 1
4 9 3 6
9 2 5
4 7 6 3
7 8
Hard #2
7
6 7 5 9
2 7 5
1 9 6 4
5 3 2 7 9
6 7 4 1
3 8 7
7
6 9 1 8
Hard #3
6 9 5 1
5 3 8 9
7 1 2 6 8
7 9 8
8 6 2 7 3
5
8 5
2 6
3 4 5
Hard #4
5 3 7 9
9
9 4 7 8 5
7 5 1 4 8
6 2
8 9
2 8
3 7 1 4
5 6 9 3
Hard #5
7 6 2
1 8 2 3 7
3 4
9 2
3 5 7 4
5 4 8 3
4
9 1 7
6 7 3 1 9
Hard #6
6 2 7 5
8 3 1
5 7
8 4 2 9
7 9 2 1
6 9 5 1 4
6 4
4 8
2 3 9
Hard #7
7 9 2
8 6
9 3
8 4
3 4 5 7 2
4 6 9
5 6 4 7
4 7 1
6 8 3 5 9
Hard #8
5 2 1 8 4 9
5 7
2 4 9
2
9 3 6 5
2 1 3
4 5 9 3 6
5 3
6 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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