Printable Hard Sudoku

Set 1cm43f9. 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 6 8
5 7 9 1
4 6 1 5
2 1 8 4
3 1 8
7 4 2
5 4 6 9
7 5
9 7
Hard #2
1
8 2 9 5 6
6 8 4
7 8 5 6
5 9 3 7
8 1 9
3 1
9 4 2
9 6 1 7
Hard #3
7 2 6
2 3 5 7
3 1 8
2 6 8 9
4 3 1 7
9 6 5 3
5 7 9 2
7 1
3
Hard #4
5 1 4
3
2 6 3 5 9
8 7 9
5 8 2
1 7 6 3
8 6
3 6 5
7 8 3 2 1
Hard #5
4 9
6 9 5 1 3
5 9
8 1 4 6
6 7 2 3
9 2 6 7 5
1 3 7 4
8
6 7
Hard #6
2 4 3 6
8 3 5
1
8 9
9 4 5 6
1 2 4
3 9 8 7
6 8 4 5
9 7 8 1
Hard #7
9 4 1
6 3 4 5
4 1 3 7 9
8 1
4 3 7
9 2 1 8
6
4 5 7 8
7 2 9
Hard #8
1 6 7 3
6 9 3 5
2 7
4 1 2 6
1 7 8
9 5
4 9 6
7 4 8 2 1
1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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