Printable Hard Sudoku

Set 11atl6f. 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
4 7 5 1
6 1 7 9
1 4
6 2 7 8
2 5 1
8 7
9 3 6 5
5 2 3 4
9 3
Hard #2
3 4 2
2 7 5
4 6 3 1
1 7 9 5
9 4 8 2 7
6 7 9
6 8 9 1
7 2 8
Hard #3
2 1 5
6 9 5 4 7
7 6 2 8
8
4 9 6 5
1 8 4
8 3 7
7 4 5
8 3 9
Hard #4
9 6 8
3 2 4
6 1 5 2 7 3
7 1 9
2 1 3 8
7 4 5
8 2 4 6
8 7
5
Hard #5
5 7 3 9
8
7 1 4 6
1 6 4 3
3 9
2 8 3 5
5 1 4 8
3 5 2 1
3 2
Hard #6
3 2 5
3 5 1 8
4 8 6 3
9 6 1 5
9 6
7 2 3
7 1 9 3
7 5 4
2 4
Hard #7
5 4 1
3 2 6
4 9 5 3
3 2
4 1 6
1 6 7 5 9 3
9 3 2
6 4 8 9
5
Hard #8
1 3
2 3 5 1 9
8 4
1 4 3
3 1 8 6
9 2 4
6 3 5 7 1 2
2 9 8
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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