Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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