Printable Hard Sudoku

Set 1ip7n6a. 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
8 3
9 5 3 6 8
1 7 9
7 6 5
4 9
9 5 2
9 3 2 4 7
4 2 8 5 1
8
Hard #2
4
8 7 9 2
6 7 1
6
7 4 8 3
2 1 3 9 6 5
2
5 2 6 4
7 5 3 1 2
Hard #3
9 6 7
8 3 1
2 6 4 3
4 3 8
6 4 7
8 2 5
2 8
7 3 2 1
5 3 1 6
Hard #4
4 7 6 8
1 9 8 6 2
3 2
1 6 8 3
4 2 7 8 5
6 5 4
5
4 9
3 8 2
Hard #5
4
2 8 3 1 6
3 4 1 8
1 3 2 5
3 9 2 4
8 9 7
7 5 8 3 6
5 2
6
Hard #6
7 1
8 6 1 3 5 4 9
4 6
8 6
7 9 5 8
1 4 2 9
9 7
4 3 1 5
2 6
Hard #7
3 7 6
8 3 5 2
9 4 2
1 2 5 7 4
5 8 7 3
7 8 9 2
9 8 5
6
1 9
Hard #8
2 7 5
8 4 2 5
9 3 1
9 6 3
3
4 2 5 7
6 5 9 3
5 1 8 7
8 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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