Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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