Printable Hard Sudoku

Set dv4ioy. 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 3
9 5
8 2
6 1 3 9
6 4 3 1
5 7 8
1 2 4 7 5 8
8
4 3 8 9 6
Hard #2
6 5 2
6 5 1
5 8 4
2 7 9
9 1 4 5
1 5 6
9 4 2
7 6 5 8
3 9 1
Hard #3
4 3
5 6
3 8 4 1 5
6 5 2
1 3 4
9 1 6 7
3 9
5 2 3 8
1 4 5 6
Hard #4
7 4 6
9
6 8 7
3 6 8 9 5
9 6
1 8 9 7
2 4 8
4 7 3 8 2
3 5 6
Hard #5
3 7 2 1 9
1
1 3 5 7
2 8 4 7
4 9 3 8 5
1 4
2 5 9
5
6 3 2 4
Hard #6
3 9
8 9
7 2 1
2 4 3 6
7 8 5
6 8 4 3 1 7
3 7 6 4
9
4 6 9 7
Hard #7
6 4 3
1 5
2 9 8 4
1 4 7 8
9 5 8 3
1 9
9 6 8
3 2
5 2 1 7 9
Hard #8
9 3
2 7 9
9 5 2
6 5 1
1 3 5 8
2 4 7
4 1
7 9 5 1
1 4 5 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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