Printable Hard Sudoku

Set r191vc. 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
8 6 4
5 3 9 1
4 7 5
2 8 4 1
9 6 4
3 5 9 7
9 8
8 6 2 7
7 6
Hard #2
3 2
2 4 6 5
1 8 3
9 5 7 6 3
5 1
6 3 4 9
1
9 7 3 8
6 1 9 4
Hard #3
9 6 8 3
6 5
6 7 4 3
5 1 3 8
1 9 8 4
8 5 9
7 4 2 1
9 2
5 6
Hard #4
1 5 2 4 3
4 6 2
7 1 4 6 9
5 6 3 8 7 4
9 8 5
8 2 1
3
6 5 2
Hard #5
6 8 2 9 7 1
8
9 1 7 8
2 8 3
1 9 8 2 4
4 3 9 5
7
9 2
1 5 6
Hard #6
8 7
5 2
9 1 3
8 6 7 2
3 9
2 1 9 3 6
2 5 1
8 6 5
1 7 2 9 8
Hard #7
2 6
7 4 1
6 3 1 7
7 8 9 5 6
8 5 4
3 1 2 4
5 9 1
9
5 4 6 8
Hard #8
5 2
8 4 5
7 6 4 1
2 4 6 5 7
5 2 8 4
3 8
6 3 7
8 1
2 3 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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