Printable Hard Sudoku

Set t3mj7c. 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
7 1 2 4
5 7
6 8
4 2 8
8 2 7 3
3 4 8 1
4 3 6
8 1 4 2
6 2 9
Hard #2
9 1 4 7
7 6 5 2 8
2 9 4
4 6 2
4 8 1
9 5 2 7
3 7 5
8 6 3 9
Hard #3
2 8
3 9 8 4
6 4 1 7
7 2 6 5
3 9 5 7
5 8 9
9
4 6 3
8 3 9 1
Hard #4
5 2
3 6 2
4 2 3 1
6 9 3
8 9 1 7 3
3 8 4
7 9 5 1
5 2
3 4 9
Hard #5
8 6
4 5 2 7
3 7 8
5 3
1 3 2 9 5 6
7 4
9
7 5 3 2
3 2 7 8 5
Hard #6
7 6 4
8 3 9
4 3 9 2
2 8 7
4 2 5
6 9 2
1 7 6 2
4 2 7
6 5 9
Hard #7
5 4 6 7
5 6 9
6 8 1 4
6 4
4 7 9
1 9 6 3
8 2 3 4
6
3 1 2 6
Hard #8
6 2 8 1 9
7 6 3
6 3 2
4 2
8 1 5
8 3 7
2 1 6 4 5 7
4 1
6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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