Printable Hard Sudoku

Set 12slf51. 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 2 1
2 1 5 7 4
5 9 7
3 7 2
6 7
4 5
9 8 4
1 4 6 2 5
2 8 3
Hard #2
4 6 3
3 2
7 2 4 5 9
2 4 3 8 7
1
7 3 4 5
5 2
4 1 5 9 8
9 7
Hard #3
7 3 5 1 6
6 2 4
2 7 8
1 6 9
9 6 4 8 3 1
3 9 5 7
8 4
2 5 8
Hard #4
8 4 2
5 7 9 4
2 6
3 4 1
6 1 7
9 7 3 4
3 2 5
4 9 2 6
1 5 9
Hard #5
6 5
8 4 7
2 9 1
8 7 5 4
9 2 3 8 6
6 3 2
7 1 8 4 2
2 5 7
9
Hard #6
4 7 5
4 7
7 8 6 1 5
2
3 6 8 7
7 6 3 1 8
2 5
9 2 1 3
4 3 9
Hard #7
5 2 1 3
3 4
8 7 5 3 9
8 2
8 9
3 1 8 2
3
8 5 4
9 7 2 5 1 8
Hard #8
9 7 4
7 5 4 1 3
8 7
9 4 8 7
8 5 1 9
1 9 2
8 6 4
6 3
1 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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