Printable Hard Sudoku

Set 1cdh21o. 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
7 3 6
3 7 8 9
4 9 2
3 8 7 1
8 6 5 3
5 6
6 4 2 8
3 6
1 3 4
Hard #2
6
6 5 3
2 8 7 1 3 5
8 2
4 8
7 5 8 3 1
8 1 4 6
2 5 7
3 2 7
Hard #3
4
3 2 9 7
7 9 6 4 3
9 5 3 2 8
2 3 7 4
6 4 1 9
9 5
1 7 3 2
Hard #4
2 7 3 1 4 6
1 7
9 4 5
9 2 5 8 7 1
3 4
1 2 3
6 5 3
3 9
7 6
Hard #5
4 6 5
4 7
3 9 5
1 9 3 6
6 8 9 2
9 3 8
9 3 2
6 8 4
5 4 1 9
Hard #6
9 4 3 6
9 5 8
5 8 1 7
3 5 2 7
9 8 6 1
2 1 9
2 4
2 5
3 1 8
Hard #7
4 8 9
3 5 6
7 8 3 9
2 7 4 8
5 9 4 2
9 6 5
6 1 5 9
1
1 9 2
Hard #8
8 4 5
1 2 7 6
3 4 8 7 5
7 3
7 2 8
3 6 1
2 5 4 8 9
2 1
4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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