Printable Hard Sudoku

Set wro40d. 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 8 6
2 4 5
9 7 4 2
8 5 7
1 9 7 4 3
2 7
7 8
3 2 6
8 1 6 9
Hard #2
3 4
9 6
3 6 2
6 1 7
8 4 5
9 5 8 3 7
8 6 7 5
6 2 4 3
1 4 8
Hard #3
2 7 9 3 6
4 8 1
9 1 6 4
6 5 2 7
7 4 8 5 9
2
8 2
9 7
2 3 4
Hard #4
4 6 2
6 9 5
6 3 1
6 4 7 9
1 7 3
1 8 9 6
4 5 7 9
6 4
8 2 7
Hard #5
5 2 8
8 5 9 6 4
7 3
6 9 3 1
1 7 6
5 7
9 8 6
6 5
5 3 1 6 2
Hard #6
9 3 1
3 4 8 6
8 2
7 1
8 4 2 9 7
1 2
7 6 5 1
4 6 1
1 8 5 6
Hard #7
6 3 5 7 8
9 6 7
1 2 9
1
3 2 8
7 3 6 5
2 1 9 5
7 6 1
5 2 8
Hard #8
9 4 3
5 3 6 8
3 5 6 4 8 2
6
9 4 3 1
7 4 8
6 7 1
7 5
4 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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