Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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