Printable Hard Sudoku

Set 1vu1ki. 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
6 4 3
2 9 3 7
7 1 8
9 3 1
7 8 3 5
3 1
9 8
5 3 7 9 6
9 6 5
Hard #2
6 4 1 7
7 3 2 9
1 3 4 6
4
2 3 4 8 9
8 5 6
6 9 1 2
8 2 4
5
Hard #3
9 7
2 1 7
1 7 4 3 5
8 9 5 2
9 1 4
3 1 7
4 8 6 2 1
9 8
3 5
Hard #4
5 7 4
8 3 4
8 6 1 7
9 3 5 8
2 4
4 8 1 2
9 7 3
5 7
5 6 9 8
Hard #5
8 5 7 9 2
6 1 3 5
1 7 3
6 1 4 5
3 6 7 1
8 6
9 5 3 6
9 4 8
Hard #6
7 1 2 9 4
8 6 2
2 4
2 9 5
1 6 4 5
8 1 4 3
7 4
8 3 6
9 6 7
Hard #7
7 2 8 6
5 3 6 9 4 8
3
4 9 3 2
1 7 9
1 7 5
6 4 5
5 6 7
3 8
Hard #8
3 5 2 7 9
8 4
9 4 7 5
4 6 9 7 3 2
9 2 1 6
6
1 9 5
2 8
9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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