Printable Hard Sudoku

Set blfb00. 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 4 9
6 5
9 1 6 7 3
6 1
7 2 8
4 2 9
8 3 4 5 7
4 2 7 9
8 6
Hard #2
8 9 3 4
9 7 6 3
6 3 1
4 6 7 8
8 4 6
2
3 2 7
1 4 3 2
8 1 9
Hard #3
5 8 6
2 5 8 4
3 7 1 6 9
5 4 3
6 2
3 1 5
3
7 5 4 8
8 1 6 9
Hard #4
4
3 9 8 2
2 1 6
9 3 7 2 1
6 2 4
1 4 2 9
8 6 7
7 9 8 6
2 8
Hard #5
7 4 1 6
4 5
2 6 1 4
5 9 7
2 8 9 6
5 6 2
4 5
4 9 2 1
5 8 9
Hard #6
1 7 4
2 4 9 5
9 1
5 1 4 7 6
6 5 2
7 3
4 1 9
2 3 6
8 9 2 4
Hard #7
4 1 3
8 9 6 7
2 7 5
4 3 2 5
7 4
5 8 1
3 1 5
1 2 4
5 6 8 9
Hard #8
9 8
3 2 5
6 1 4
1 3
7 8 3 9 5 2
6 9
5 6 3
6 1 7 4
4 2 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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