Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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