Printable Hard Sudoku

Set 14im40q. 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
2 9 5 6 8
5 4 6
4 3 8 2
5 2 7
1 7
9 3 4
2
5 9
3 5 8 1 7 6
Hard #2
2 5 1 7 8
5
1 5 6 7 9
4 8
3 9 8
2 7 1 4
8 5 1 6
6 5 9
9 3
Hard #3
2 7 6 5
1 2 7
5 8 9
5 7 1 8 3
8 9 1
1 4
8 3 6 9
1 7
4 9 2
Hard #4
2 5 1 4
4 7 5
6 3 9
3 1 8 9
1 9 2 3
8
8 5 9 3 6
7 3 1
6 4
Hard #5
8 5 2
7 1 8 4 3
6 4 5
1 9 8
5 2 7
3 6 4
8 7 4 3
2 1
7 4 5
Hard #6
6 7 1 9
2 4 7
1 5 3 8 2
6
7 8 9
4 3 6
8 2 3 7 6
8 2 9
7 4
Hard #7
4
8 7 4 9
3 7 5 6
9 2
5 8 7
7 4 1
8 3 9 6
1 6 7
9 4 2 8 3
Hard #8
2 8 7
8 4 9 2 1
7 5 6
3 6 9 5
3 2 4
1 5 6
7 3 6 5 1
7
5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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