Printable Hard Sudoku

Set 197nqqo. 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
5 2 9 3 1 4
1 8 4
2 8 5
2
7 5
4 7
8 1 2 4
9 6 3 1
1 9 5 2
Hard #2
9 4 8
5 1 8 9
8 6 7
9 6 2
4 7 5 8
7 4
4 6 8 2
1 2
3 7 9 1
Hard #3
4 7 9 6 5
8 1 4
2 9 4
9 8 1
5 2 3
1 6 4
2 4 9
7 1 2
1 7 4
Hard #4
9 6 7 4 2 1
4 9 3
8
6 7 5
2 5 6
4 1 3 6
8 7 3
1 8 5 4
4 6
Hard #5
8 1 7 6 5 9
3 8 9 2 1
4 8 7
9
2 6 9 7
2 1
3 7 1 6
9 6
6 5
Hard #6
8 1 3
8 5 9
1 6 3 4 7
7
7 8 5 1
3 7 1 9
2 1 6 8
1 4
4 8 2
Hard #7
1 9 4
5 4 2 8
8 5 1
6 7 5
2 6 1
7 2 5
7 8 9 3
3 8
3 9 7 2
Hard #8
1 4 9
2 6 8 1
6 9 3
4 5 2 1
5 9 6
3 2 9
5 1 9
7 1 5 4
2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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