Printable Hard Sudoku

Set 1h63ogl. 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
2 7 5 4
6
7 8 4 9 3
1 4 5
6 8 1
3 1 8 4 6
6 3
2 9
3 5 8 1
Hard #2
2 4
4 1 8 5
7 6 5
2 4 7 1
7 6 3 9
1 3 9 2
4
6 8 7 9
7 9 4
Hard #3
7 5 3 9
2 1 8 7 6
6 2 3
1 5 9
1 7 3
4 8 9 5
9 5
7 8 6
9 7
Hard #4
8 9 2
8 6 2
3 7 1
1 7 4 5
3 2 1
6 4
6 3
8 3 9 1
9 4 7 8 5
Hard #5
4
5 4 6 1
6 5 3 9
3 9 4
8 7 3
2 1 9
9 7
1 2 8 9 5
4 7 6 2
Hard #6
8 3 5
6 9 8
9 7 6 3
8 5 1 7
2 5 3
5 3 7 8 6
4 7
9
3 2 6 4
Hard #7
3 9 8 2
1 9 6 3
3 2 1
9 7 2 4 5
5 6 8
2 3 5
7 2
5 1 7 2 9
Hard #8
4 2 5 9 1
6 1
3 1 2
7 8
3 2
9 1 2 6 5
1 2 3
3 9 6
4 3 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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