Printable Hard Sudoku

Set 1afb4oo. 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
4 3 1 6
1 2
6 7 8
9 4
3 4 6
8 5 9 2
5 2
6 7 5 9 2 8
4 6 7
Hard #2
3 9
2 8 4
4 1 2
9 7 1 8 3
5 6 4
4 9 1
4 6 9
6 2 7 4
3 7 1
Hard #3
5
9 4 5 6
8 2 6 7
2 1 7
9 3 7 6
1 4 5
3 6 8
9
4 5 9 1 8 3
Hard #4
3 9 8
2 3
2 4 7 6
1 9 4 8 3
2 1 9
6 8 1
8 6 5
2 1
1 5 7 2
Hard #5
4 7 3 6
4 1 5
6 5 4 8
3 4 2 8
9 1
2 8 5
9 4 3
7 2 8 6
6 5
Hard #6
9 5 7 2 6 1
1 8 2
9 3
6 5
4 6 3 1
2 5 8 6
3 8
2 1 7
9 2 5
Hard #7
9 1 6 3
5 8
6 1
4 1 5 9
3 6 4 1 8
6
5 6 2 3 7
4 1
5 1 4 9
Hard #8
6 2
1 8 6 7
3 8 6 4 9
1 8 5 4
6 2 9 7
3 4 2
5 8
8 2 3
1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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