Printable Hard Sudoku

Set 11ymn48. 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
5 7 1
7 1 6 5 2
2 4 7
3 9 8
8 6
1 6 2
6
2 4 9 3 8 5
5 6 9
Hard #2
5 1 7
4 7 2 9
7
1 3 5 7
2 7 6 1
3 7 5
8 5 3 6
9 8 1
6 4 8
Hard #3
2 3 6 8
4 8 2 9
5
8 1 2
8 9 5
2 9 1 6 4
6 4 2
3 9 5
7 1 4
Hard #4
6 7 9 4
1 9 8 5 6
3 5 1
3 2 8 6 7
4 9
6 1
6
6 9 8 4
3 1 6
Hard #5
2 3 5
4 1 2
7 1 5
3 2 4
8 9 2 1
5
6 7 9 4
4 1 3
9 2 1 8 7
Hard #6
5 9 2 4
8 9 6
7 4 5 1
2 1 9
3
4 2 8 6
7 4 1
8 6 5 7
9 1 2
Hard #7
3 1 7 2
1 8 3
3 5
3 9 6 8
2 9 5
4 7
4 8
5 7 3 9 4
9 4 1 5
Hard #8
9 2 1
2 6 3 9
9 1 4 8 5
1 5 7 4 8
1 9 7
6 2
8 2 5 3
9 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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