Printable Hard Sudoku

Set kr0v36. 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
3 1
6 5
1 7 4 9 8
5 9 1 4
4 3 6
9 5
2
9 1 6 4
7 2 3 9 4 6
Hard #2
4 2 1
5 6
5 3 9 1
3 7 8 9 2
4 3
2 6 5
2 6 5
8 3 1 5 2
7 4
Hard #3
4 2 1
8 4
3 6 7 2
9 7 3 1
3 4 7 9 6
4
7 5 6 3
5 4 7
8 1 5
Hard #4
5 3
2 7 5
5 9 2 6
6 8 5 9 4
9 8 6
7 4 9 1
1
4 7
9 1 6 8 2
Hard #5
7 9 1 3
6 7
9 2 5
6 2
5 8 1 4 9 7
3 2 1
8 7 1
1 8
1 2 7 4
Hard #6
1 9 6
3 2 9 6
6 1 5 8 3
5 6 8 3
7 1
3 2
1 4 6
8 5 1 6
3 7
Hard #7
3 8 9 4 2
2 7 1 5
6 5 9
3 8
7 5 6
4 5 7
9 3 5
4 2 8
8 5 1
Hard #8
1
3 9 5 6 7
8 5 3
2 6 5
8 2
4 9 1
1 8 2 5
7 1 8 9 2 6
4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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