Printable Hard Sudoku

Set 126xt7o. 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 4 1 6
9 4 7
6 4 2 7
8
7 5
4 7 8 1 9 2
9 8
7 3
8 6 4 7 2
Hard #2
4 3 5
9 1 6 2
9 3
6 7 9
9 5 6
4 3 2 9 8
5 7 6
3 2 7
4 8 1
Hard #3
2 8
8 4 2 6
1 3 9 8
1 3
6 2 9
9 1 4 8
5 8
5 1 6 3
9 3 7 4
Hard #4
7 4 5
8 5
9 2 1 8 7 3
9 4 7
6 4 9 7 1
8 5 1 4
3 6 8
4
5 2
Hard #5
6 5 9
5 7 4 1 3
1 2
9 1 6
4 6 9 8
8 9
3 4 6
5 7 9 2
1 5 3
Hard #6
3 2 8
4
8 1 6 5 9
6 7 2 9 4 1
1 4 3
7 9 2 4
4 3 2
6 9
5 7
Hard #7
8 4 6 3
9
2 1 5 9 4
1 6 4 8
4 9 6 1 2
8 3
9 1 3 6
1 5
5 3
Hard #8
9 6 8
5
4 1 2
5 7
2 8 3 1
9 7 6
8 3 5 6
4 8 9
6 7 5 9 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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