Printable Hard Sudoku

Set 1bcud3k. 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
3 5 6
1 7
2 5 9 3
2
1 5 6 8
9 1 3 2
9 2
7 4 6 2 3 9
7 3 4
Hard #2
8 3 2 4
9 6 8 1
5 6
4 9 7 8 6
3 9
7 6
3 2 7
9 5 8
1 7 2 3
Hard #3
4 5 3
3 8 1
7 1 2
9 5 1
6 7 4 8
3 1
6 8 3 9
5 1 9 6
7 2 1
Hard #4
9 1 4 3
5 3 9 8 4
4 7 8 2
4 3
5 2 9
3 9 7 5
9 3 1
6 9
4 5
Hard #5
1 8 3 9 2
3
2 9 5 1
2 6 1
7 3
5 2
1 9 4
4 6 2 5 8
5 8 6 1
Hard #6
8 3 2
6 3
9 4 3 7
7 6 9 4
4 2
6 5 8
2 9 8
1 6 4 7
4 9 2 1
Hard #7
4 5 7
9
8 6 7 1 5
1 5 4
2 8 3 1
6 7
4 9 2 8 3
8 7 4
3 4 7
Hard #8
4 2
1 5 2 4
2 7 5
9 2 1
3 2 4 8 5
7 1 2 4
1 3 7
8 1 5
7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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