Printable Hard Sudoku

Set 1c5zb80. 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
4 9 5 2
3 2 9
8 4 3 2
9 5 8
3 1 5
7 4
3 8
6 2 7 8 5
Hard #2
2 8 3 7
9 2
5 3
6 3 5 9
1 5 6 8
2 4 7
2 9
3 2 7 9 1
5 4 1
Hard #3
5 2
8 6
1 5 7 6 4
6 8 9
2 4 3 8
8 4 2 1
5 1 6 4 2
3
2 9 3
Hard #4
2 8 5
6 4 2
1
2 6 8 5
7 1 2
3 2 7 5 6 1
6 3
1 4 9
7 1 2 4
Hard #5
7 2 1
2 6 8
6 9 5 7
1 9 7 5 4
9 3 6 1 2
3 7 9 4
6 5 3
6 4
Hard #6
1 4 2
6
7 3 1 2
5 8 6 9
4 1
1 6 7 8 3
1 8
8 4 6 5
4 5 2 6
Hard #7
4 1 3 6 9
5 2 3 6 4 8
7 9 3 5 4 2
3 8
2 7 1
1 7
6 2 9
6 3
Hard #8
3 6
7 2
8 1 2 7
9 3 6
8 6 9
1 9 3 5
7 4 5 9 8
4 9 7 1
8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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