Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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