Printable Hard Sudoku

Set 12zw1wz. 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
6 9 5 2
5 3 4 6
3 5
9 7 2
9 2 4
6 1 9
5 3 7
2 9 6 4
7 8 9
Hard #2
3
8 9 2
3 2 6
6 4 9 1 8
9 8 6 5
7 1 9
7 1 2 8 3 9
9 2
3 7
Hard #3
4 3 7 8
8 3
1 9 3
8 2 4 9
1 6 3
4 6 1 7
5
7 2 9 1
6 2 5 3
Hard #4
5 6
1 8 3 2 4
2 9
9 3 5 8
6 4 2
8 1 7 3
5 6 1 8
1 6 9 2
8
Hard #5
1 3 5 8 7 6
5 8 1
6 7 9
1 8
6 1 3 4 9
6
3 8 2 6
7
8 9 7 3
Hard #6
3 6 9
9 4 8
4 7
7 5 2
1 7
3 8 5
7 4 9
2 6 7 4
8 9 3 2 6 1
Hard #7
2 5 9
4 6 8
3 5 6 1
7 6 2 8
7 1 3
8 2
8 4 1
6 7 8 9
5 1 3
Hard #8
9 3 4 8
2 4 5 8 7
8 2 9
8 1
4 1
7 9 3
5 2 9
8 9 6 5
1 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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