Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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