Printable Hard Sudoku

Set og1nqc. 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 7 8 9
1 6 3 8 7
1 4 6
8 6
7 9 4 5
2
4 6 2 7 3
1 7
9 6 8
Hard #2
8 6 3 2
2 3 6
7 8
4 8 2 5
6 9 4
8 4 2
7 9 5
4 2 8 9 7
2 1
Hard #3
6 5 1
3
7 8 4 5
3 6 7 9
2 4 5 3
7 5 9 1 8
9 3 4 7 2
5 8
1
Hard #4
8 9 4
7 5 1
3 7 9 6
8 3 1
3 1 5 9
1 5 6 4 3
5
6 1
7 4 8 9
Hard #5
5 6 2
8 1 6 3 7
2 3
5 1 7
1 7 6 2
4
9 4 5 7 8
5 9 7
6 1 8
Hard #6
1 5 7
6 3 2
9 3 1 6 8
8 9 5 6
7 9 1
5 2 4 3
9 4 1 6
7 2 4
Hard #7
3 6 2
5
8 2 7 1 5
8 6 2 3
1 9 7
6 4 5 8
5 7
2 9 4 8
1 3 4
Hard #8
1 6 4
8 3 5 7 9
7 8 5 6
4 7
9 6
7 3 5
3 9 5 7
7 6 3
2 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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