Printable Hard Sudoku

Set 1n6k2dw. 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
3 6
3 5 6
7 5 4 9 3
1 5 7
4 7 8
8 4
8 3 2 7
6 9 7 4 2
2 5
Hard #2
5 2 8
7 4 6 2
3 8 7 4
5 9 2
4 7
7 1 6 4
1 5 2 3
6 4 2
1 8
Hard #3
6 7 9 4
6 7 8 5
3 2 4 1
7 2
5 9 1
9 1
5
7 8 9 4
9 1 7 6 5
Hard #4
3 2 5 6
9 4 8
2 6 9 1
5 4
1 3 4 8
7
8 6 3 5
6 8 3 4 1
9 2
Hard #5
3 5 2
6
8 5 2 7 3
4 2 5
7 5
9 6 4
8 2 5
7 1 4 3
2 4 3 6 7
Hard #6
4
1 4 9 7
1 8
7 1 9 5 8 4
5 6 2 7
3 5
4 8 5 2
9 6 4 8 3 7
Hard #7
5 2 7
8 4 2
2 1 9 4 6
8 7 4
4 3 7
1 2 6 7 5
9 5 8 2
4 3
9
Hard #8
4 3 2 7
9 2
6 5 8 7 1 9
2 9
4 5 6 8
7 6 1
5 2 7
3 2 4
3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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