Printable Hard Sudoku

Set 1c6lunv. 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 1 6
4 8 9
3 7
9 4
4 3 2 5 6 1
2 4 3
9 8 1 6 2
6 9 7 2 5
Hard #2
7 8 3
8 1 2 9
7 8
5 4 1 8
6 8
9 4 5 6
3 4 2
7 6
8 3 1 7 4
Hard #3
6 2 9 4 5
3
9 4 1 7 2 5
9 2 1 8 7
1 8 2
2 9 3
8 7 5 4
6 8
Hard #4
1 3 2 6
5 7
4 1 6 5 8
8 3
1 5 3 7
3 7 1 5
3 8 2
9 2 1
5 9
Hard #5
4 8 7 1
3 1 6 4 9
7 6
5 9 8
5 9 4
2 3
2 7 9
5 6 1 8 4
7 4
Hard #6
7 4 1 9 2
6 7 9 4
1 3
4 8 7 5
5 2 9 8
7
4 7 6
2 4 7
9 8 5
Hard #7
1 3
5 4 7
4 8 7 9
2 1 7
5 7 1 2
3 6
1 9 5
3 9 6 1
3 5 8 4
Hard #8
1 2
5 7
7 4 6 2
2 3 8 6
1 8 4 6 2
6 5
8 9 7 1
1 9
9 1 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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