Printable Hard Sudoku

Set dk0c0. 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 6 3 9
3 2 5 4
6 1 7
3
9 4 7 6 8
7 8 4
5 2 9 6 1
1 2 7
9
Hard #2
4 1 2 9 3 8
5
4 5 1 9
8 4 1
2 9 6
9 8
6 8 9
3 5 9 6
3 1 2
Hard #3
3 6 4 1
1 7 8
9 8 3 6
3 5 1
3 4 2
9
7 8 6
9 7 4
4 6 9 3 1
Hard #4
4 7 9
1 8 7 4 6
5 2
3 4
8 2 9 3 1
5 2 8 6 7
8 5 3 7
6
7 9
Hard #5
6 4
7 2 1 6 3
8 2
8 1
2 9 4 1
4 1 6 9 8
1 9 4 5
4 9 3
9 5
Hard #6
2 6 9
8 7 2 1
6 5
4 3 1 2 7 8
9 3 1
8 1
5 9
6 3 5 4 2
4 3
Hard #7
5 4
6 1 7 3 4
9 4 6 1
8 5 4
6 7 5
3 6 8
5 2 6
7 4
6 1 3 7
Hard #8
3 9 5
9 3 1
5 1 4
4 7 8 5 9
2 4 1
2 3
3 1 6 4
2 9 5
6 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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