Printable Hard Sudoku

Set k2s6j9. 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 4
1 2 6
7 1 9
3 6 8 1 7 5
5 7 2
9 5 2 1
2 7
4 1 3
7 6 5
Hard #2
1 2
6 5 3 4
3 7 1 6
5 3 8 4
8 1 6 2 9
5
6 7 1
4 7 8
9 1 3
Hard #3
3 7 9
1 9 4 5 3
6 9 7 4
2 1
3 2
6 3 9 5
4 8 3 9
4 6
6 8 5
Hard #4
8 4
4 5 9 1
7 4 8
7 5 6 2
6 7 9
6 5
9 3 1 5
2 8 5 7
8 3 4
Hard #5
8 3
9 1 2
5 6 9 4
3 2 9 4
4 6 5
8 4 2 1
7 8
5 8 4 6 3
7 5
Hard #6
7 9 1 5
9 5 1
8 2 3
8 5 7 9
8 6 3
6 2 8
8 6
1 2
5 2 6 4 3
Hard #7
9 8
6 9 4 1 5 8
5 1
3
3 1 6 7
2 7 6 5 3 8
8 6 5
5 4 7 1
9
Hard #8
9 4 1 7
5 8
9 7 2 1
6 1 5
9 1 4 7
4 5 6
8
9 6 2
1 5 2 4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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