Printable Hard Sudoku

Set a9100c. 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
8 2 1 9
6 1 4
7 4
1 2
5 8
2 3 9 7
8 3 1 6
7 6 4 1
3 9 7 5
Hard #2
4 2 1
7
2 1 9 7 8
5
4 7 8 2
7 6 1
4 8 9 5 6
9 4 1 7 3
3 8
Hard #3
1 3 2 5 4
9
2 6
8 1 4 7 6 2
7
4 6 3 1
3 2 8
6 5 4 3
3 9 1
Hard #4
6 7
5 4
6 2 5
9 3 4 7
6 8 9 1
4 8 6 3
1 7 6 5
4 9 6
2 6 1
Hard #5
7 9 2
4
6 2 3
3 5 2 4 8
1 4
4 7 3 9 1
9 6 4 5
1 5 6
5 9 2
Hard #6
5 2 4
8 9 6
1 2 6 4
4 7 2
9 5 2 3
7 6
3 8 1
9 6
9 5 4 2 1
Hard #7
2 5 9
4 2
5 7 6 8
5 9 4 6
2 1
6 1 8
8 1
6 1 7 4 3
9 1 3 5
Hard #8
5 6 2
8 4 9 1
1 6 7
6 1 9
3 8
9 6 5 4 3
4 2 9 7
8
9 3 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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