Printable Hard Sudoku

Set yvmb6i. 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
8 3 6 4
6 4 2
9 8 5 1
3 1 8
2 7
9 6
9 8 6 7 3
3 5 1 9
9 4
Hard #2
7 8 6 3
2 5 8
4 6 7 9 5
9 1 3 8
6
7 1 5 2 4
3 5 9
2 8 7
4
Hard #3
2 3 9
6 7 4
4 3 5 8
9
8 9 4 3
7 6 4 1
1 2 8 5
6
9 8 5 1 6
Hard #4
8 2
7 2 9 1
1 3 7 4
1 9 6 3 8
8 5 3
1 2
4
5 3 7 9
9 4 3 7
Hard #5
1 9 8 7
5 1 2
8 7 6
7 3 6
9 2 1
6 1 9 3
4 7 8 9
2
6 8 7 3
Hard #6
4 8
1 2 8 4 3 5
3 9
7 2
6 5 7 9
4 8 3
9 5 3
1 8 5 9
8 2 4
Hard #7
2
6 4 7
7 2 3 9 1 8
3 7 1
4
6 5 8 3
5 7 3
1 7 4 2
6 9 5 7
Hard #8
6 3 9
8 3 6 1 2
7 4 8
5 4 2 7
5 8
9 4 1
9 3 7 8
8 6 2 5
6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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