Printable Hard Sudoku

Set by1fd2. 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
6 3
4 1 2
5 4 6 7
5 7 4
3 2 1 4
4 9 1
6 8
7 5 8 2 1 6
7 5
Hard #2
6 7 5
7 1 3 9
9 1 2 6
9 1 8
4 1 5
5 4 8 9 2 3
7 3
4 6 8 7
Hard #3
2 8 9 5
9 7 3 2
3 1 4
9 5
8 4 3 2
2 7 9 1
8 5
1 6
6 7 4 9
Hard #4
9 1 3
4 5
3 5 2 7 9 8
2 3
8 5 9
2 9 8 4
2 9 7 1 6
7 5 4 3
Hard #5
5 9 7
9 2 8 3 6 1
9 6
1 5 9 6 8
7 1
6 4 5
2 8
3 5 2 9 4
6
Hard #6
4 7
9 6 4 7 5
2 6 1 8
2 4 5 6
8 3 9
9
7 2 3 5 4
8 5 9
1 7
Hard #7
9 5 8
8 3 9 6
5 3 7 1
6 3 9
6
1 9 8
9 2 4 8
3 8 6
1 7 2 8
Hard #8
6
1 3 4 7 5
5 7
9 8 1
6 4 9 1
7 2 8
5 6 4 2
9 5 7
8 2 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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