Printable Hard Sudoku

Set o0db4y. 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 5 3 4
4 9 5
8 9 6
4 7 8 3
7 5
6 8 4
3 9 1
9 7 4 2
7 5 9
Hard #2
9 2 4 8 5 3 7
5 1 6
6 3
1 7 3
8 1 4 6
4
2 7
8 7 6
1 2 8 3
Hard #3
5 6 4
2 7 3 6 5
1 7 4
5 7 8 6
4
2 5 8 1
8 5 9 4
3 6 1 8
4
Hard #4
2 9 7 1 8
3 5
7 8 2 3
6 7 1 3 8 2
9 4
4
1 3
6 4 8 2
3 6 5
Hard #5
8 7 4
9 2 1
8 3
1
5 7 9 2 1
2 4 7 5
4 6
3 6 4 9 7 8
3 8 1
Hard #6
2 5
1 4 9 2
6 7 5 1
2 9 7
7 9 2 1 8
4 8
1 7 4
2
2 5 1 3 9
Hard #7
7 4 2 9 5
6 2 8 4
5 7
3 8 6 5
9 8 3
6 3
9 2 6
8 3 7 9
9 8
Hard #8
4 6 2
1
1 6 9 4
6 2 4 9
7 4 8
4 3 1 5 7
3 9 8
5 2 7 1
8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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