Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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