Printable Hard Sudoku

Set ah6ncj. 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
7 6
2 8 7 4
4 8 3
6 1 7 2 8
5 3
1 8 5 2 9
3 2 8
5 1 2
4 7
Hard #2
4 6 7
5 7 6 8
9 6 3 1 5
9 2
3 2 7 8
7 8 9
9 2 3
5 6 7 9
3
Hard #3
6 8 1 4
2 9 4 6
4 2 6 3
4 9 7
5
8 1 7 2
7 2 1 3
4 9
1 3 5
Hard #4
4 3
4 9 7 2
5 2
9 1 3 8
8 5
4 7 1
5 6 9 7
7 6 1 8
7 5 8 4
Hard #5
9 2 3 4
1 5 7
3 5
4 7 2 8 1
9 2 6
9 4
8 9
6 7 8
9 7 4 8 2
Hard #6
6 1 9
5 1 7 6
3 8
2 1 6 7 9
6 9 8
8 3 5
2 5 8 4
9 6 5 2
6
Hard #7
1
4 9 7 6
7 1 6 9 5 4
4 1
3 8 4 9
7 2 8
3 8 5
3 1
2 4 1 8
Hard #8
9 8 3
3 4 2
5 7 4
3 2
2 4 6 3
5 3 1
3 1 4 9 7
2 9 1
9 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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