Printable Hard Sudoku

Set 1mn5sno. 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
2 7 6
4 3
9 3 5 8
4 6 8 2
1 3 4 5
8 2 6 3
9 7 6
2 5 4 6 9
Hard #2
3 9 8
4 3 1
7 9
6 2 7 3
4 8 7 6
3 6 2
6 8 1
2 3
7 3 8 1 4
Hard #3
6 3 5 8
7 6 8 3 1
4 6 9
7 1 3
8 5 2 6 4
4 8
9 6
3 5 9 2
4
Hard #4
2 7 5 9
7 1
3 4 2
4 9 1 2
1
7 5 3 8
5 1 6 8
2 4 9 3 5
3 5
Hard #5
5 2 4
7 6 3 9 8
1 4
9 8 6 1
2 8 5 4 9
6 1 4
2 4 3
7 9 8
5
Hard #6
5
3 7
6 7 5 1
9 7 4 2 3 6
3 2 9
8 4
1 8
6 1 2 3 9
8 7 4 6
Hard #7
1 7 5 9
4 5 8 6
2 6
2
5 7 8
4 7 3
3 1 7
7 4 2 3
5 3 1 2 4
Hard #8
5 1 3 7
1 6 2
4 6 2
7 1 9
9 5 6 2 1
4 8
3 7 8
7 5 9 8
6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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