Printable Hard Sudoku

Set 1k3socg. 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
2
5 4 7
7 3 2 5
5 6 9 4 2
4 3
6 8 2 1 9
7 5 1 3 4
4 3
1 6
Hard #2
7 4 9 2
5 3 8 6
1 5 6 3
1
7 5 6 8
2 7 4 6
4 7
7 2 1
3 5 6
Hard #3
4 2
3 9
2 4 7 8 6
9 8 5 4 2 3
5 6
3 5 7
7 2 1 8
6
9 1 8 3
Hard #4
5 9 8 3 2
8 7 1 9 4
6 3
4 7 2
6 7
5 9 8 2
8 3 7
5 9 3
9 7
Hard #5
3 1
4 9 2
8 6 3 7
5 9 7 1
8 4 2 5
1 5 9
6 4 5
7 6 5
1 8 4
Hard #6
2 7 3
4 3 5 2
9 2 6 8
7 9
4 3 6 8
6 8 4 3
8 4 9 5
1 9
5 1
Hard #7
5 1
9 7 1
1 3 7 6
3 9 7
4 6 5 3
1 8 6
8 5 2 4 3
7 5 2
4 9
Hard #8
8 5 4 2
6 7 8 1
1 2 3
1
3 6 4
6 8 3
5 3 9 1
9 2 5
1 5 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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