Printable Hard Sudoku

Set lz2rbt. 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 3
1 2 5
8 2 5 1
3 6 4 9
1 4 7
9 8
8 4 7
4 6 3
6 1 4 2
Hard #2
8 6
6 7 3 8
3 8 1
1 5 4
5 8 3 2
4 5 6
6
2 4 1 9 8 3
5 9 2
Hard #3
9 7 3 1
1 7 8
7 2 8 4
3
8 1 6 2
5 4 8 9
1 4 8
3 9
6 2 1 8
Hard #4
7 3 1
1 6 8
2 8 9 5 4
5 6 3 1 4
7 4
6 1 2
6 5
8 9 2 5
4 2
Hard #5
8 4 5
5 6 1 3 8
9 2 7 5
1 9
2 9 8 6 5
5 4
6 1 4 8
6 7 2
8
Hard #6
5 2 6
7 5 8
6 1 4 2
7 2 3
8 1 5
5 3 1 9
6 2 9
2 6 3 8
3 9
Hard #7
9 8 7 3
6 1
6 8
6 5 1 8 7
4 7 6 8
5
5 1 3
1 9 8
8 3 9 2 6
Hard #8
2 4 9 3
8 9
7 4 2 6
1 3 7
9 3 5 8
7 9 6
3 9 6
8 7 1 5
2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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