Printable Hard Sudoku

Set 10ybe0v. 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
3 6 4 2
9 1 6 8
5 8 3 9
7 1 6 3
9 1
4 3 7 5 6
5 8 2
3 5
6
Hard #2
1
1 5 3
2 6 7 4
5 8 6
3 1 4 2
7 5 8 9
9 2
3 5 7 6
8 6 1 5
Hard #3
7 6 9 5
6 1
2 8
5 4
3 6 1
3 9 1 7 8
6 3 7 5 1
1 3 4
2 7 3
Hard #4
8 3
6 3 2 8 5
5 2 4 6
6 5 1 2
3 9 5
6 4
9 7
8 3 2
1 2 9 7
Hard #5
1 2
3 8 6 2
3 1 9
6 3
2 4
1 9 2
5 7 8 4 3 6
1 5
6 5 7 2 8
Hard #6
7 4
1 3 2
4 2 5 9
7 5 4 9
5 6 1
7 3 8
2 9
8 4 5 3
7 1 4 2
Hard #7
2 1 6
8 3 7 4 1
1 4
5 9 8
3 9 2 1
5
1 9 2 7
8 3 7
8 6 4 9
Hard #8
8 3
5 1 3 7 9 2
9 1 8
6 7 3 5
2 7
2 4 6 9
9 3 4 8 5
8
6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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