Printable Hard Sudoku

Set sd9se0. 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
1 2 6
1 9 2 4 5
5 8
7 9 5 1
8 6 5
4 8 3 7
1
5 4 8 7
4 9 3
Hard #2
8 5 3
6 9 4 3
4 2 7 9 6
8 5 1 2 4
2 1 4 9
3
3 8
9 4
9 7 5
Hard #3
5 7 2
6 5 1
7 1 2 9 3
5 6 7
1 7 3 8
8 3 9
9 8
9 2 5 4
4 1
Hard #4
5 2 3 6 1 4
1 9 8 2
6 5 8
9 3
8 9 6 7
2 4 1
3 7
5
1 8 7 5
Hard #5
3 5 9 2
9 1 5 8 6
7
7 6 2 1
5 7
8 6 3
2 9 5 4
7 4 9
9 3 6
Hard #6
3 7
4 8 6 3
7 5 3 1 8
4 2 9 6 8 5
7 4 3
5 2
6 2
6 7
7 1 9
Hard #7
8 5 7 9 4
9 8 6
1 3
4 1 2 6 9
8 9 5 3
4
6 3 7
9 3
3 6 5 1
Hard #8
4 8
2 9 7 5 4
5 2
2 3
8 9 2
3 4 7
6 7 4
5 2 3 1 9
8 7 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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