Printable Hard Sudoku

Set 1gor0ly. 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
1 8 5
4 5 6
5 6 9 4 2
3 8
6 4 2
6 5 9
4 7 5 3 9
7
9 6 2 8
Hard #2
8 4 1
7 2 5 6
3 5 4
7 8 1 5
2 3
3 1 6 2
5 3 7
6 9 2 4
1 7
Hard #3
2 3
5 9 1 7
6 3 8
1 2 5
5 7 1
2 3 6 7 8
4 8 3 2
2 9 7
3 7
Hard #4
6 4 1
3 4 7
5 7 8 3
8 3 6
7 2 5 9 1
4 2
9 5
1 3 8 4 9
1 2
Hard #5
5 2 1
3 2 7
6 9
7 4 8
5 2 6 1
5 8 2 6
5 7 6
8 4 1 3 2
3 2
Hard #6
5 3 1 8
8 1 7 6
7 6 5 2 1
1 9 8
2
8 3 5 9
7 2 4
2 4 7 8 6
Hard #7
2 4 9
3
9 1 6 5 2
8 4 2
4 1 7 9
9 6 1
5
2 1 6
4 8 2 3 5 1
Hard #8
6 1 9
2 1 3 5 8
3 6 8 7 1
3 2 5
2
3 4 7
5 7 6 3
6 8 7
4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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