Printable Hard Sudoku

Set 6l9rco. 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
8 9 6 7 4 3
7 9 2
3 5 7 9 1 6
4 1 5
7
6 4 5 7
8
6 9
2 7 1
Hard #2
3 4
1 3
9 5 3
2 4 1 6
3 2 8
7 6 3
2 7 8 5
6 1
4 7 3 1 9 6
Hard #3
7 2 3 5 4
2 8
1 9
4 7
5 1 4
8 9 4 6 5
7 1 9 6 8
9 8
4 1 2
Hard #4
6 8 4 1 9
8 5 3
9 2 1
5 7 9 3 6
7 2 5
3 6
5
2 1 4 7 6
2 1
Hard #5
3 7 5 6
6 5 7 9 8
1 4 5 7
8 1
2 8 4
5 1 7 9
3 9 5
7 6
3 9
Hard #6
3 4 8 2
9
8 5 1
7 5
8 3 6 7
5 6 9 1 4
6
3 4 9 2 8 7
5 7 9
Hard #7
8 6 9
4 8 5
4 3 6 7
3 7 2 5 4
5 9
6 3 1
6 7 3 1
6
3 8 4 2
Hard #8
4 3
9 2 5 6
1 2 9 4
1 6 9
4 5 7 2 6
6 8 4
1 8 6
5 9 3
8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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