Printable Hard Sudoku

Set r4r80x. 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
6 2 4 9
1 6
3 9 5 1
7
2 6 1 4
4 5 2
6 4 5 2
9 3 2 8 6 1
1
Hard #2
4 7 1 2
5 6 1 8
6 3 7
3 2 8 5 9
4 2
5 7 8
9 1 8
1 9
2 1 3
Hard #3
4 5 7 6
8 1
1 6 8
4 6 9
6 5 4
5 2 7
6 3 2
9 3 2 1 6
5 9 7
Hard #4
6 8 5
1 4 9
8 6
7 1 3 2
1 6
1 5 7 6 4
4 5 8
6 9 1
9 1 6 3
Hard #5
9 6 3 2 5
4 8 6
2 4 8 9
8 1 9
1 2
7 3 2
5 9 6
6 3
8 1 2 7
Hard #6
4 9 2 8
7 8 2
6 1 3
1 6 7
4 6 3 2
8 7 5
8 5 6
4 3 8
3 8 7
Hard #7
3 2 4 6 9
6
9 3
5 2 8 4
4 6 7
4 8 9
6 9 8 1 3
1 6 9 4
8 7
Hard #8
1 5
7 8 4
6 1 9 8
2 1 3 4
3 9 8 5
6 2 1
7 3 6 8
5
8 2 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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