Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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