Printable Hard Sudoku

Set a2o3mo. 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
5 9 8 6
4 1 3 8
5 4 7
2 5 8 1
3 9
4 1 5 6 3
8 3 7
1 4
4 9
Hard #2
9 6
6 8 2 4 5
2 1
7 5 3
5 2 4 9
9 3 1
6 2
2 9 3 8 4
8 3 2
Hard #3
8 6
1 9 2 3
2 6 7 4
4 6 1
2 6 7 8 4
5 3 2
1 9 2
4 9
3 8 7
Hard #4
4 1 7 3
9 5 2 1
3 2 8 4
7 1
9 6
5 2
4 5 2 8
8 5 3 7
6 3 9
Hard #5
6 8 2
5 6 4
8 7
8 2 4 9
4 6 3 5 9 8
2 5
4 9 6
7 4 5 8
3 5
Hard #6
4 3
8 6 4 5
2 9 8 6
6 2
2 4 5 3 6
4 7 5
5 2 3
6 1 8 2
4 1
Hard #7
3 8 2 1
5 3 2 6
7 8 4
4 3 6
2 4 8 7
9 8 1
7 4 9 6 5
7
1 6
Hard #8
4 7 6 9 8
5 6
9 1 4 3
6 4 9 5
7 5 2 4 9
9 5 6 2
4 1 5
3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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