Printable Hard Sudoku

Set 1kmy2km. 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 4 2
9 1 6
3 1 5 9
4 1 8 9
6 8 2
3 4
7 3 8
8 6 7 2
4 6 5
Hard #2
5 6 9 2 1
4 5
4 8 2 3
2 7 8 1
3 4
7 1 4 5 9
8 5 1 6
2 7 5
Hard #3
2 8
6 3 4
9 4 8
7 2 5
2 3 5 1 8
8 1 9 6
4
6 3 4 2 1
1 9 3
Hard #4
3 7 4
9 1 3
2 6
6 1 5
3 1 9
4
1 3 7 5 9
2 9 3 6
7 5 8 1 3
Hard #5
8 1 4
6 3 8 2
2 4 6 1
5 9 4
9 8 6 1 5
3 4
1 4
9 3 6
5 6 8
Hard #6
1 6 3
2 9 4 1
1 2 9 5
2 8
1 6 2
4 2 7 6
7 3 4 9
6 3
4 7 5
Hard #7
8 6 9
6 8 5 3
1 9 7
3 2 5 8
8 1 3 9
4 8 2
5 6 4
8 2
7 1 6
Hard #8
9 3
3 2 1
5 1 9 2 7
9 7
4 3 7 5 2
3 8 6
2 7 8 1 6
7
3 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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