Printable Hard Sudoku

Set m6gx7x. 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 4 1 5
9 3 5 8
5 6 4 3 1
2 8 4
7 6
3 2 9
8 4 6
6 3 1 9
2
Hard #2
4 1 2 8
5 4 2 3
3 6 2
3 8 6 2
3 5 1
8 2 1 7
3 7
5 1
6 2 9
Hard #3
3 1 6 9
9 1
3 4 7
3 5
8 2 7 3
9 4 2
8 3 6
1 9 2 5 7
6 2 1
Hard #4
9 5 6 1
6 1 8 2
1 3
8 1 7
4 5 2
9 6
5 1 2 9
8 1 3 6
7 4 1
Hard #5
3 2 4 9 5
7 2 9 1
6 2
2 7 6 5
1 7 8
3
4 9 3 8 1
8 3 5
8 4
Hard #6
8 6
2 8 6
1 7 9 4 3
8 2 1 6 4
3 1 8
6 5 4
9 6 2 4
9 5 2
6
Hard #7
2
4 7 6 8
3 8 5 1
2 6 4 9
7 8
8 4 7 1 3
9 8 7 2
4 3
1 3 6
Hard #8
2 3 7 6
1 2 9
5 9 1
3 9
8 5 6 3
9 4 8 6
5 9 2 1
7 2 1
3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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