Printable Hard Sudoku

Set 110adkm. 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 9 8
6 8 7
7 1 6
1 5 7
4 2
7 9 2 6
8 6 7
5 4 1 8
9 4 7 5
Hard #2
9 3 1 6
7 6 1 9
2
4 5 2
7 3 9 1
6 3 8
2 7 3 4 9 5
6
5 8 7
Hard #3
1 3
7 4 3 2
7 9 8
4 9 6
7 4 9
8 1 7 2
6 8
2 7 4 5
7 9 5 1
Hard #4
3 9
9 1 2
6 9 4 8
3 6 9
9 2 7 6 4
8 7 4 1
5 8 2 1
3 5 6
1
Hard #5
4 6 9 2
3 4 7 1
1 4 2 6
3
2 7
9 4 7
4 7 8 5 1 9
8 5 7 9 2
Hard #6
8 3 5 1
4 2
5 9 7 3
7 4
8 1 5 6
4 6 9 1
7 5 6
9 3
6 9 7 5
Hard #7
9 2 3
4 1
4 8 7 9
8 3
5 7 6 4 1
2 4 6
4 1 8 3
7 9 2 5
8 3
Hard #8
6 2 4 9
1 6
3 9 5 1
7
2 6 1 4
4 5 2
6 4 5 2
9 3 2 8 6 1
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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