Printable Hard Sudoku

Set 1b327if. 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
5 4 2 6
6 8
6 3 7
1 9 7 4 2
3 2 9 4 8 1
1
4 3 7
6 7 5
2 6
Hard #2
9 4
1 4 8 5 9
6 5 8
7 5 4 3
3 1 5
1 9 8
4 6 1
3 5 4
2 7 8
Hard #3
2 8 1 6
3 6 7 4 9
6 3
4 9 7 2 8
9
3 7 9 6
5 8 1 9
7 4
2 6
Hard #4
1 8 7 2
3 4 9 6
6 7
1 8 4 9 2
9 5 7
7 8 2 3
4 6
6 1 7 5 9
Hard #5
5 2
1 4 5
5 6 9 4
2 5 4 3
9 3 6 8
6 1 7
9 2 6
7 3 6
8 2 7
Hard #6
8 1 7
5 8 4
9 3 5 1
3 5 2 6
8
1 5 3
6 5 3
7 9 8
3 2 6 1 7
Hard #7
9 4 7 5
4 9 6 7 8
2 9
7 8 2
2 4 7 5 1
2
5 1 4 8
5 6
1 8 5
Hard #8
5
2 5
9 4 3
2 7 6
5 1 9 2
9 3 4 1 5
5 1 9 6
6 3 2 7
7 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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