Printable Hard Sudoku

Set m0l4uf. 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 1
1 7 5 9 4
5 4 8
9 3 8
2 8
1 9 4
5 6
3 1 7
7 3 4 1 5 2
Hard #2
7 2
5 8 3
4 2 5 1
6 9 2 4
7 9
4 5 3
4 8
7 6 9 2 5 1
1 3 2
Hard #3
7 4 3 2 6
1 2 8 4
8 9
9 4 5 2
2 3 4 7
1 9
7 1 2 4
6 5 3
9
Hard #4
6 9 2 7
2 9
3
4 5 3 1
5 1 8 4
6 8
2 1 5 7
4 2 6
6 2 4 9 3
Hard #5
4 3
9 7 4 2 8 5
4 8
1 5 2
9 3
7 8 9
6 3 1 5 9
1 7 8
7 8 6
Hard #6
6 1
4 1 5 9 2
7 8 9
6 3 2 8
2
2 7 1 5
4 7
9 1 7 4 6
2 3 4
Hard #7
3 5 6 8 2
8 5
7
4 3 6
6 2 3
5 3 7
9 4 2 7 6
7 1 6 2 5
3 9
Hard #8
8 6 1
2 1 7
5 7 2 3
5 3 8 7
6 1 3
1 9
5 6 7 4
8 7 4
7 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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