Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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