Printable Hard Sudoku

Set grv2cn. 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
4 7
1 6 4
9 1 2
7 2 5
6 8 5 3 9 2
9 3
2 7 4 5
5 2 3 9
2 6
Hard #2
6 8
5 9
6 2 7
3 2 7 4 9
9 4
5 7 3
8 6 7 1
2 1 5
1 8 5 4 9
Hard #3
4 8 9 5
9 1 2
5 4 3
5 8 2 6 3
8 5
2 6
6 7 3 8
9 4 3
4 5 7
Hard #4
3 8 6 2
2 9 6
4
2 5 3 1
1 4 9
1 3 8
3 7
4 8 1 3 7
1 9 4 3
Hard #5
8 3 1
4 5 2 7
9 6 3
9 5 1
8 3 2
4 3 8
6 8 4 9
7 1
7 5 8 6
Hard #6
9 8
5 8 4 6
2 4
5 6 9 7
2 8 5
7 4 6
6 9 2 5
7 1 8
2 6 1 3
Hard #7
2 1 5 9
6 4 7 2
4 1 8
5 6
6 7 3 1 9
4 1 8
8 4
9 5
3 8 5 7
Hard #8
9 7 4 2
1 4 3 6 7 5 9
8 1 6
4 3
9 6 5 8
7 5 9
3 8 1
6 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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