Printable Hard Sudoku

Set ze3v0b. 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
6 3 2
7 5 3
2 8 1 9
9 1 3 5 8
5 6 9
1 7 8 2 3
4
1 5 2 8
Hard #2
8 5 7 9 2
5 6
2
7 9 8 3
2 9 4
1 7 5 2
8 2 3 6
5 8 6
4 8 7
Hard #3
8 2 9
3
7 6 4 2 9
1 8 2
2 7 3
5 9 3 6 4
4 9 5 8
3 8 2 7
8
Hard #4
7 5 9 4
9 6
1 6 4 8
9 7
1 7 8 3 2
3 4
7 4 9 2 3
9 1
6 8 7
Hard #5
2 3 9 8
3 4 6
6 2
6 8 3 5
7 5 9 1
5 2 4 8
9 1 7
7 5 2
8 7
Hard #6
3 7
7 4 5 3
9 8 3 4
9 3
6 2 1
4 7 9 6
1 3 4 9 6
5 7 8 1
7
Hard #7
3 6 1 4
1 4 7 8 3
2 4
7
6 1 9 8 7
9 7 2 3
3 5 4 9
5
8 2 7
Hard #8
8 2 3
7 9 5
2 5
4 2 9 6
6 8 5 3
7 3 2
9 3 8 1
1 5 3 8 4
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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