Printable Hard Sudoku

Set 3k26i0. 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 6 5
6 7
5 2 7 8
9 4 6
9 8
1 2 9
8 9 1 6 4
4 3 1 8
3 8 9
Hard #2
9 7 3
5 1 7
4 8 5
3 6 9 2 8
9 7
4 9 1
3 1 8 6
7 8 3
8 6 9
Hard #3
9 8 7
8 5 7
4 3 9 8 6
7 4 8 1 6
2 3 4 8
2
9 4
5 7 2
2 5 1
Hard #4
8 2 5
5 9 2 3 1
4 5
8 6 5 7 9
1 6
6 7 3
4 7 9 3 6 8
6 7
3
Hard #5
8 7 5
4 9 3 6
7 8 3
3 9
2 7 1 8 5 3
7 4 3 2
3 2 6 1 4
4 7
Hard #6
6 9 3
1 6 7
4 2 9 8
5 1 6 4
5 8 2 1
7 6
3 1 8
1 9 3 2
5 1
Hard #7
7 2
9 6 5
5 1 2 8 7
1 5 4 3 2
8 4 2 1
9
2 6 5
8 9
4 1 7 3
Hard #8
2 8 9 7
9 3
7 6 2 8
4 9
3 5
2 4 1 5
8 1
3 5 9 4
1 9 7 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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