Printable Hard Sudoku

Set 9gic96. 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 9 5 1
7 3 1 4
6 5 3 9
8 7
1 6 3 9
4 6
9 2 1
5 6
4 6 5 3
Hard #2
6 3 2 5
3 2 4 1 9 8
6
3 5 2 7
6 8 3
4 6
1 2 5
8 2 4 1
4 9
Hard #3
4 7 2
3 6 7 4
8 3
9 6 4 8 1
3
1 8 5
7 1 8
2 9 3
9 1 2 7 6
Hard #4
8 3 9
6 8 7
1 5 9 4
1 7 5 2
8 1 9
8
7 1 4 6
4 2 3 1 9
5 3
Hard #5
6 2 8
3 6 4
7 2 5 8 3
9 3 1
1 4
9 6 3
7 5
4 5 1 7 3
5 8 2
Hard #6
9 7 6 1 8
7 2
6 4
9 5 6
7 5 3
2 1
5 1 2
7 6 1
3 8 6 7 4 5
Hard #7
6 9 7
9 7 5 4 1
7 4
1 2 6
2 3 1 5
7 8 3
4 5 3
3 6 9
9 6 4
Hard #8
8 6
2
9 3 4 5 8
5 8 7 1 2
2 6 9 7 5
7 1 9
5 1
1 4 3
9 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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