Printable Hard Sudoku

Set 1gf90w1. 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
2 8 6 4
4 2
4 2 6 9 7
6 1 3
1 4 7 5
5 1
3 9 4
3
7 8 9 1 4
Hard #2
7 2 9 1
1 6 2 9 8
4 6 2
8 3 7
1 5
8 4 6 9
1 3 8 9
5
7 2 6
Hard #3
5 6 8 7
1 8 7 6
7 9 1 2
9 1 4 7 8
3
6 1
1 4 9
4 5 6
5 8 2
Hard #4
3
2 7 6 8
6 3 7
6 4 9
1 9 2 4
7 4 5 3
3 5 7 1
7 1
6 4 5 7
Hard #5
3 4
7 8 2
2 5 1
8 7 5 3
1 5 3 8 2 4 9
8
9 7
2 1 6 8 5 7
4
Hard #6
6 8 4 3
1 5
9 8
5 9
4 8 5 3 6
6 3
1 7 4 3
1 8 9 4
3 8 4 1
Hard #7
2 8 4 6
4
3 5
5 9 7 2
6 1 4
7 1
8 1 6 4 9
9 2 4 3
6 8 5 7
Hard #8
4 7 5 1
6
6 1 3 4
4 2 9
9 7 2
1 6 5
5 7 2 6
3 8 9
4 1 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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