Printable Hard Sudoku

Set jo0dww. 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
4 3 9 2
3 7 1
8 7
8 1
4 7 9 2
6 2 7 8
2 5 4 3 6
3 1
8 6 4
Hard #2
4 7 6
2
5 9
2 4 8 9 1 6
9 3 5 2
3 5 8 9
1 8
1 3 5 8 9
5 4
Hard #3
6
1 7 3
4 3 1 6 9
1 6 7 8 5 3
2 4 6
8 5 9 7
2
9 1 2
6 5 2
Hard #4
8 2 1 4
9 7
3 6 4 9 5
1 4 8
2 6
8 3 4 9 1
5 9 4
9 8 1 6 7
Hard #5
3 6 2 8
6 9 5
1 2 7 5 3
2 3 5
3 1 6
5 4 2 7
5 8
9 5 7
1 2
Hard #6
1 7 2 5
4 8 3 6
5 1 9 2
7 5
2 4 5 3 9
2 8 1
7 6
6 2 4
5 9
Hard #7
1 9
5 2 8 9 3
3 7 5 6 4
4 6 1
7 8 6
6 9 5
2 8 1 4 9
8
4 7
Hard #8
2 5 8 1
1 5 4 6 2
8 4
2 5 7
9 3
6 2 3 5
2 4 7 1 3
9
7 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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