Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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