Printable Hard Sudoku

Set 7c083n. 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 7
5 2 3
4 7 8
1 3 5 2 4 9
9 8
9 3 2
7 5 3 1
9 1 6 5
6 1
Hard #2
8 5
1 6
2 9 7 1
4 5
1 5 7 2 4 6
3 1
6 1 9 2
4 8 3 9
2 6 5
Hard #3
2 5 6
1
2 4 5 1 9
9 4 6 2 5
5 7 4
8
3 6 9 1 7
2 6 8
7 2 3
Hard #4
7 3 6
6 2 4 8
2
1 8 3 7
2 8
4 9 7 2 3
2 5 1
9 5 1 8
4 1 5
Hard #5
4 3 7 2
7 4 8
2 9 1 5
7 8 2
8 9 5 1 3
5 2 4
1 2
4 3 9
3 4
Hard #6
6
5 1 3 7
1 3 8 9 2
7 5
4 9 8
6 7 1 4
3 7 2 5 6
5 7 1
8 9
Hard #7
8 3 2
6 9 7
5 6 9
7 5 2 1 6
5 8
3 6
4 9
6 4 3 8 7
6 8 1 9
Hard #8
2 4 1
4 9 8 5 3
7 9
5 3 8 4 2
7 2 8
3
6 3 1 2 4 5
1
2 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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