Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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