Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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