Printable Hard Sudoku

Set 18coy9h. 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 9
6
7 5 4 3 6 8
3 5 9
6 2 1 8
3 7
3 2 6 1 8 5
5 4 6
7 6
Hard #2
6 1 9 2
3 8
2 7 8 4
4 2 3 6
9 1
7 1 5 8 9
5 9 7
4 6
3 1 8
Hard #3
7 3 1 5
1 7 4
9 2
8 3 4
3 6 7
7 6 1 2 5
6 7 4 3
5 8 1 6 2
Hard #4
8 2 9 4 1
4 5
2 5 6 7 3
8
9 4 3 1 7
7 9 2 5 4
1 6
9 3 1
5
Hard #5
2 1 8
3 5 7
2 4 3
9 1 6
8 2 9 3 7 4
5 4 8
7 3
6 5 2
3 4 6
Hard #6
4 7 6
9 8
7 4 1 9 5
3 7 9 5
5 4 7
5 9
2 7
5 4
7 6 3 1 5 8
Hard #7
5 9 4
3 9
1 9
8 7 4 2 6
5 9 1
1 4 7 3
9 8 2 6 7
2 6 1
1 4
Hard #8
2 7 5
4 8 3 7
5 8 6
5 1 3
1 4 7 9
9 3 8
3 4 2
9 3 1 8 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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