Printable Hard Sudoku

Set 12tg2se. 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
5 1 4 8
3 7 6
2 3 4 1
3 5 8
4 2 8
5 9 3
2 7 9
6 8 1
7 5 6
Hard #2
7 5 6
3 5 8 9
2 5 4 1 3 7
2 7 5 9
2 6
7 8
1 3 9
4 6
1 4 2
Hard #3
8 5 2 6
3 4 8
2 7
5 2 7 3
7 1 4
9 6 3 1
5 3 6 1
2 6
2 7 9
Hard #4
4 8
3 4 6
6 9 5 2 4
9 5 6
3 7 4
1 2 3 5
5 9
7 3 4
2 1 6 3
Hard #5
8 9 5
9 4
6 1
9 3 2
3 2 8 9
1 8 5 7
4 8 5 3 1
2 4 1 5
6 2
Hard #6
7 6 5 9 4
8 6 7
9
2 3 8
2 3 4 5
8 1 2 6
8 9 7
5 2 6
3 7 2
Hard #7
8
5 9 1
6 5 2
8
6 7 2 9
9 7 3 6 5
4 1 7 6
6 8 3 4 1
1 7 5
Hard #8
2
9 1 2
6 1 5 8
3 2 4 5
2 9
9 4 1 2 8
6 3 9 7
4 9 8 3 5
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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