Printable Hard Sudoku

Set ken0c8. 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
1 4 3
7 6 3
8 5 2
3 5
5 8 4
7 3 8 2
8 3 6 7 9
4 3 9 8
5 2
Hard #2
2 8 3 7 6
6 9 2
5 9
7 9 8
8 6 4 3
4 2 5
9 4 8
2
3 5 2 9 1
Hard #3
6 9 8 7 2
2 4 7
7 5 6
9 6 4
8 4 7
9 3 1
1 3 6
8 7 3
4 2 8
Hard #4
7 3 5
9 8 3 1 6
3 2 7
3 2 4 7
5 7 6
8 7 6 9
5 1 2 8
9 8 3
Hard #5
7
3 4 5 7
7 6 3 9 4
1 4 8 2
7 4 8 3
6 1 2 7
5 2
8 5
8 5 6
Hard #6
1 8 5 7
4 3 6 2
9 4
6 9 5 1
1 3
7 8 2
5 1 9 6 3
3 5 6
3 2
Hard #7
6 1 5
4 2
8 3
4 7 9
1 8 6
2 6 1
3 1 4 5 6
9 1 5
8 6 9 3 1
Hard #8
4 5
8 2
7 1 6 3 9
2 5 1
7 8 6 5
5 4 9 3 7
1 8 2
3 8
4 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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