Printable Hard Sudoku

Set ugki1u. 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
4 2
8 6 1 7
9 7 8 4
1 5
5 2 1 9
6 5 4 3
7 8 9
3 8 6 7 5
6
Hard #2
1 8 5 6
6 2
3 7 9
1
8 2 7 5 3
1 6 5
5 4 8 7 9 3 6
1 7
2 9
Hard #3
8
9 5 1 7
3 2 8
7 3 8
8 1 5 2 6 9
6 1 9
5 4 1 3
9 2
8 5 1
Hard #4
3 4 8 2 9 6
1 7 6 8
7 4
2 1 4 8
7 5 3 6
1 2
8 3 5
9 4 7 3
Hard #5
1 6 2 8
2 3 9
6 1 4 5
7 9 6
6
4 5 3 9
3 2 8 9
5 9 1
8 7 3
Hard #6
1 9 7 2
2 4 1
7 5
8 5 9 4 7
9 8
3 4 8
7 1 2
6 3 1
9 6 3 5
Hard #7
1 2 9 6
7 8
8 4 3 2
5 1
8 7 2 3
2 9 1
2 1 7 4
4 8 3 1 7
4
Hard #8
9 2 6
5 2 4
6 8 9
6
5 3 4
4 7 6 8 1
9 1 5 4
7 9
1 8 9 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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