Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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