Printable Hard Sudoku

Set 1cb4mxm. 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 1 9 8
9 5 2 7
1 2 9
7 9 4
5 6 8
7 3
9 2 1 4
2 3 8 1
Hard #2
5 9
8 3 2
2 8 4
9 8 5 7
2 3 9 1
6 9
2 8 1 6
6 4 2 9
9 7 3
Hard #3
1 7 3
6 9 8 1
9 6
4 5 9 3 6
6 3 8
3 9 4
8 6 5
4 3
1 2 5 7
Hard #4
7 9 4
3 4 7
1 6 7 3 5 9
5 3
5 1 7 3 8
8 2 7
5 4
4 9 5
3 1
Hard #5
1 9
2 1 4 5
3 7 2 4
8 9 1
1 9 3 5
4 1 2
9 8 2
7 4 3
7 8 6
Hard #6
8 5 7
2 5 6
3 2
7 3 8
1 8 7 4
2 5 7
5 9 8 1
9 4 5 7
4 8 5
Hard #7
7 5 9 2
9 2 6
6 3
4 8 3 2 7
4
5 2 7
4 2 1
9 2 5
3 8 9 1 4
Hard #8
1 8
2 8 7 4
5 6
6 9 2 8 5
1 5 4
8 7 9
2 9 1 5
3 4 7 9
7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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