Printable Hard Sudoku

Set 11xqtej. 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
3 6 1
4 5 3
9 1 3 7
8 7
3 9 6 8
8
3 9 1 2 5
9 5 7 4 3
Hard #2
1 8 2 5
8 3 7
7 4 5 1 9
5 1 9
6 5
3 9
6 5 7
4 3 7 5
5 4 8
Hard #3
3 2 7 8
3 1
4 6
5 1 8 9
9 7 5 1
1 4 5 7 6
7 4 2 5
1 8
8 2
Hard #4
9 2 3
6 3 7
7 4 8
8
6 3 9 1
1 7 8 5
2 7
4 8 3 7
8 4 5 9 2
Hard #5
1 2 8
6 9 1 2 5
7 5 9 2
2 7 3
9 3 6
4 8 2 1
5 4 8
6 8 5
7
Hard #6
1 9 5
7 9 6
5 4 8
4 7 6
7 2 1 5 6
9 2 7
1 9 3
4
5 2 3 7 1
Hard #7
6 9
3 4 1
8
9 7 5
5 1 4 6
8 2 6 7 9 1
7
7 2 8 1 9 3
7 6 2
Hard #8
7 6 3
5 9 2
3 9 5 4
4 8 9
2 3 8 6
3 1 4
8 1 6 7
5 2 8
9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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