Printable Hard Sudoku

Set huf3ox. 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 7
9 3 2 8
7 9 5 1
5 6 3 9 2
3 8 5
8 4
4 6 2
1 7
4 8 2 5
Hard #2
7 4
7 3 6
5 2 9 7
7 2 4 1 5
3 9
5 6 2
9 6 5 8 4
1 3 6
9 2
Hard #3
2 1
7 1 4 5 8
3 6
4 6 8 1
7 9 4
2 8 7
8 9 5
9 1 6 2
4 8 3
Hard #4
1 8
1 8 4 2
5 3
8 3 2
9 2 7 6
6 4 9
8 6 3 1
7 2 6 4
6 9 8
Hard #5
6 7 1 2
7 8 1
1 5 9
3 6 1
5 2 3 4
9 4 5 3
4 3 8 5 6
6 9 5
Hard #6
6 1 4 5 7
5 9
3 7
2 4 8
1 8 5 6
2 3 4 8 1
6 3 5
3 5
2 1 4
Hard #7
2 8 4 9 7
5 7 6
4 5 8
7 5 4
7 5 3
9 8 7
3 2 8
9 2 1 4
4 9
Hard #8
4 6 9
1 7
2 9 7 1 3 8
9 6 2 5
7 3 2 4
8 7
9 4 3 8
1 6 2
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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