Printable Hard Sudoku

Set 18jm6pt. 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
9 6 7
2 3 1 9 8
4 1
5 1 7 4 3
3 6 2
8 4 7
6 3 5
8 4 7
2 4
Hard #2
7 8 3 1
9 3 4
2 5
1 7 6 8 5 4
2 1 3
9 4
6 4
5 7 6
2 1 4 8
Hard #3
5 6 2
5 2 3 9
8 4 3 5
8 9 4
4 1 3 8
7 3
4 2 7
6 7 9 1
3 5
Hard #4
4 5 7
3 2 5 1 9
7 2
8 4 6 5
2 5 7
9 5 1 4 8
3 8 6 2 4
4 3
Hard #5
8
7 1 3 8
4 6 2 7
4 2 3 9
9 2
3 6 2 5 7
4 3 1 2
1 9 7
7 8
Hard #6
4 5
8 1 7
9 4 7 5
2 1 9
3 9 7 2
8 4 5 6
2 4 3
7 8 6
9 1 3
Hard #7
6 2 1
8 1
5 8 3
8 3 7 4
8 5
7 1 6
7 4 8
3 5 1
4 2 8 9 1 6
Hard #8
4 2
2 8 6 1 3 9
3 9 6 8
9 1 4 5
4 6 3
1 9 4 7
8 6
2 7
3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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