Printable Hard Sudoku

Set 1ozd1ai. 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
7 9 8 2
8 5 3
9 2 7 6
3 9 1
2 7 6
5 6 8
8 2 9
9 1 2 5
3 7
Hard #2
6 3
9 7 2
3 8 4
1 7 2 4
4 2 1 5
6 4 8
9 7 5 3
3 1 7 9 6
2
Hard #3
9 8
6 3 4 9 7
4
9 2 7
6 2 9 4 3
3 5 7 6
6
8 6 3 7
1 9 2 8
Hard #4
7 4 3 6 5
9 8
8 7 3
9 5 7 6
6 1
5 3 4 1
1 4 6 9
6 5 4 3 1
Hard #5
4 1
3 9 7 5
7 5 2 4
9 5 7
6 1 3
1 8 9 2
8 7
2 6 3
7 4 6 2
Hard #6
6 5 1 4
4 7 3
9 2 4 7
2 9 5 4 6
1 7 9 8
6
3 4 1
7 3 8
7 6
Hard #7
7 1 3
2 3 9 7
1 4 6
9 6 7
7 1 4
8 7 6 4
6 2
5 2 1
2 4 9 7
Hard #8
7
1 9 8 7 5
8 3 4 6
4 9 5 8 1
5 3 6
9 5
2
6 1 5 4 8
5 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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