Printable Hard Sudoku

Set ck6sgl. 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
4 5 8 6 7
9 3 5
9 8
9 7 6
6 7 3 9
1 5
2 6 1
4 6
7 3 1 2 4
Hard #2
7 1
1 5 4
6 2 7 5
2 6 3
5 8 4
7 9 2 5
2 1 6 3 8
4 3 8 9 7
Hard #3
7 6
2 8 7 4
1
6 5 4
5 9 3 8 2
3 4 2 7
8 9
8 2 4 1
2 9 5 1
Hard #4
8 6 4 5
1
5 8 9 2
7 4 3 5
3 8
2 3 5 4
9 8 3
6 5 8 7 1
2 6
Hard #5
9 1 8 2 7
2 3
6 9 5
7 3 9 4
5 9
2 6 3
2 7 1 6
9 4
8 5 4 1
Hard #6
9 2 4 6
7 8
6 3 7 4
1 8 6 2
3 2 6
3 5
9 4 1
8 4
4 6 1 5 7
Hard #7
5 2 1
8 6 3 9 2
9 2 8 4
7 5 3
8 4
1 3 2 8 9
7 3
9 6 1
4 7
Hard #8
1
3 5 8
9 4 7 6
3 8 5 1
9 8 2
6 1
7 3
9 8 6 5 1
5 1 3 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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