Printable Hard Sudoku

Set qv1r35. 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
3 1
4 8 6
3 1 6 4 7
2 6
6 2 9 7 1
7 1 9
1
8 9 4
9 2 6 8 5
Hard #2
6 5
8 3 1 9
9 7
8 1 5 6 7
4 5 2 1
5 1 7 2 3
1 5 8
9 4 6
9
Hard #3
2 3 6
6 4 9
1 8 9
8 7 4 5
5 2 8
3 7
8 6 7 5
8 5
4 3 7 2 6
Hard #4
6 4 9 7
5 3 6 9
7 4 5 1
9 3 5 4
5 9 2
8 7 3
8 2 5
6 9 1
2
Hard #5
9 6 1
9 8
4 6 8 5 9
8 9 5
1 2 8
9 6 4
5 2 8
3 2 6 7
9 3 4
Hard #6
8 6 5
3 7 9 4 6
7
6 8 2 9
9 6 4 5
7 5 3 2
1 5 8
2 1 4
3 5
Hard #7
6 8
8 9 7 4
5 3 9
7 3 2
1 5
8 5 4 7
2 9 8
7 9 2 1
5 6 8 1
Hard #8
3 8 2 6
7 2 3 1
6 1 7
9 4 7
4 5
5 1 2 6
7 9 3 8
5 2
8 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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