Printable Hard Sudoku

Set 16oqi50. 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
4 9 1 6 2
8 1
3 4
4 3 9
6 8
1 2 6 5
2 9 7 5
6 3 9 8
5 9 7
Hard #2
5 4
2 3 5
9 8 1
1 2 5 4
8 6 3 5
8 2 6
4 2
8 1 5 7 6 9
3 1
Hard #3
3 1 6 4
9 4
7 9 1 2
2 4 5 6
2 3 6 1
6 5 8 9
6 8
6 3 1 7
9
Hard #4
9 7 5 8
5 4 1 2
3 6 9
5 8 4
6 9 5
1 3 5
2 7
1 8 2 5
2 9 7
Hard #5
9 4
8 3 9 7 1
5 6 7
7 1 5 6 9
4 3
3 6 4
7 6 9
3 4 5
1 8 2
Hard #6
2 1 4
8 4
7 9 5
4 1 7 2
3 8 6 5 9
5 3 4
3 6
6 2 3
5 9 2 4
Hard #7
2 4 3 9
3 6 2 1 4
8 5 2
7 2 5 1 8
1 9 4
4 8 2
8
7 4 6
4 1
Hard #8
1 7 3 9
4 6 3 9 7 8
9 7
8 9
6 4 1
9 4 5
6 3 1 7
6
1 5 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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