Printable Hard Sudoku

Set f7uo4v. 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 8 4
9 2 1 8
1 7
1
4 2 3
2 7 9 5 8 4
6 5
5 7 9 8
3 9 2 5
Hard #2
2 6 5
5 9 7
3 2 1 4
5 3 2
7 2 4 3
2 7 5
7 4 6 9
8 2
9 8 6
Hard #3
6 2 4
9 5
3 6
8 5 3 4
2 4 8 1
9 3 2 5 4
5 6 8 1
8 7 2
4 6
Hard #4
4 7
4 5 3 9
2 7 8
6 4 2
2 9 8 7
4 7 1 2 6
3 5 9
1 9 2 4
8
Hard #5
7
3 6 1 8
1 9 3
2 6 4
1 8 4 2 7
5 2 1
6 5 8 9
4 7
3 9 8 2
Hard #6
8 1
8 2 6 3 9 7
4 8
9 1 2 7 6
8 3 7 1
2 8
8 5 9
5 6 1 3
3
Hard #7
6 7 8
5 9 4
1 8 3 9
8 1 2
7 4 3 5 9
5 4 1
8 7 3
2 6 7 5
1
Hard #8
7 2 4
6 1 4 7
8 6 3
3 2 7 8
4 6 5
2 1 8 4
9 8
4 7 9 1 6
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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