Printable Hard Sudoku

Set 11tf99e. 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
5 3 2 8
6 8 5 3
9 1
1 5 2 6 7
2 1 8 3
7
4 6 2 7
8 6 1 2
7
Hard #2
1 8 5 4
6 7
4 6 7 8 2
4 5 3
9 8 1
7 1 4 8
9 1
7 9 4
3 8 6
Hard #3
7 1 4
2 6 9
3 5
9 7 3
8 1 5 9
5 3 8 9
3 9 2
7 1 6 4
2 8 6
Hard #4
8 9
5 9 3
6 4 2
7 9 3 4 5
5 6
1 5 7 4
4 2 7 8
8 9 2 5 3
9
Hard #5
9 5 3 6
2 9
7 3 5 8 1
4 1 8 2 7
8 4
7 3 4 9
5 8
6 2
3 1 5
Hard #6
4 3
8 9 1
5 8 6 1 9 7
4 9 8 6 3
5 3 8
7
7 6 9 4 8
6
3 7 2
Hard #7
7 3 4
9 8 1 5
1 8 9
8 6
5 2 7 1 3
3
4 5 9 2
7 1 3 6
9 5 2
Hard #8
6 3 7 5
2 3 8
1 7
7 9 5 2 3 6
9
2 3 9 5 7 8
7 1
4 9 8
6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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