Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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