Printable Hard Sudoku

Set lu6b2t. 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
5 6 8 1 7
7 2
2 8 9 1
6 9 1 2
3 5
1 6 4 9
7 8
1 6 2
7 3 6
Hard #2
8 1 9
2 4
3 6 7 5
4 1 6 3
2 5 7
9 4 6
7 1 3 5
7 2 1
9 7 8
Hard #3
1 5 7 2
5 6 7 8 1
5
3 4 2 8
6 8 1
6 9 2
4 3
6 1 5 4
6 2 9
Hard #4
5 8
7 1 9 6
9 3 4
5
3 2 7 4
9 3 6 1
7 8 3 2
8 6 2 7
2 4 9
Hard #5
1 6 2 9
3 6 2
2 7
6 4 5 7
5 8 2 4
6 9 3 8
5 7
9 3
8 9 1 6
Hard #6
8 9 2 5
6 1 8
7 1
4 9
3 2 8
9 5 8 7 6 1 4
4 9 7
3 6
7 8 3
Hard #7
3
3 6 2
2 9 7 6
4 7
3 1 5 8
9 8 4
7 6 9 2
5 6 4
4 8 1 3 9
Hard #8
2
1 7 9
9 8 7 5
1 7 2 6
6 9 5 4
8 5 4 7
2 6 4
4 8 6 1
3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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