Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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