Printable Hard Sudoku

Set 6gn6da. 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
9 2
8 2 9 4
2 5 9
7 6 4 9
9 6 1
1 6 8
8 2
8 6 9
4 8 6 1 5
Hard #2
8 6
4
3 2 6 1
9 8 2
2 1 7 3 5
7 1 6
4 6 7 1 2
4 9 7
8 5 9
Hard #3
3 8 5
6 9 2 5
4 9 3 7 1
5 9 7 2 6
2 3
4 1
2 4 5
1 6 7
1 8
Hard #4
8 9 3
3 1
7 9 1 5
9 2 3 6 8
8
8 5 9 7 4
6 7 8
2 4 7 9
6 5
Hard #5
6 1 7 5
8 4
3 8 7 9
9 8 6 2
4 6 7
4 1
9 7 5 4 3 6
1 5 7 3
Hard #6
2 3 4
7 4 8 1
6 1 9
5 1 3
3 5 6
7 8
9 4
7 8 1
2 1 4 7 8 9
Hard #7
1 6 4
9 2 7 6
3 9
9 3 4
7 2
1 9 8 7
4 1 5 8
8 3 1
6 9 2 5
Hard #8
7 8 5
3 4 1 2
9 2 7 5
4 5 1
3 9 6
2 3
1 9
6 9 4 3 8
3 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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