Printable Hard Sudoku

Set 16ru7vs. 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 3 2
3 2 7 1 5 6
8 2 4
9 3 1 8 7
1 9 2
4 7
1 6
1 9
5 6 1
Hard #2
9 7 5
2 6 4 3
8 1
3 2 4 9 7
1
2 3 6 4 5 8
3 4 2
4 8 5
1 6
Hard #3
4 2 5
7 6 9
2 7 6
1 2 7
4 6 1 3
3 7 5 1
7 2 4 3
6
8 1 3 5
Hard #4
5 3
3 8
6 9 7 1
1 7 8
2
9 1 6 5
6 4 3 8
7 1 2 5
9 2 3 4 6
Hard #5
6 5 2
2
8 7 2 1 9 6
6 4 1 8
1 6 5 9 4
5
8 6
2 7 8
5 7 1 8
Hard #6
2 1 8 7 9
3 5 6 2
9 5
3 1
6 1 7 4
5 8 4 9
1 2 3
4 3
3 5 9
Hard #7
4 5 2
6 7 1
8 9 5
1 2
3 9 7 1
2 3 9 4 8
2 3 9
9 5 2 7
8 1
Hard #8
5 3 8 4
2 9 5
5 8 3
8 7 4
7 1 4 6 2
9 6
4 6 9
8 6 5
6 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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