Printable Hard Sudoku

Set f4opxr. 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 9
5 4 7 2
3 7 8 2
2 9
6
9 8 1 5 7
6 5 4
7 3 1
4 3 8 6 9
Hard #2
7 1 4
4 5 9
5 3 2 1
6 3 5 8
9 6 7 4
7 1 6
1 8 5
9 1
4 3 8
Hard #3
3 5 1
8 9 1 3 6
6 8 5 4 7
2 8 7
5 6 4
9 5
1
7 8 4
9 3 7 2
Hard #4
8 3 7 2
1 9
6 4 8 9
7 3 9 4 1
1 7 4
4 1 6
2 6 8 5
9 2 3
4
Hard #5
1
5 1 8 3 4
3 9 5 8
6 4 8
9 1
7 9 4
5 7 3 2
9 4
6 4 9 5 3
Hard #6
7
5 9 6 4
1 3 4 2
8 9 7 3 2
2 5 1 9
6 5
1 3 4 6 7
7 3 6
1
Hard #7
7 5 3
2 6
4 7 9 6
5
9 8 2 5 1 4 6
3 9 8 1
8 5 3
5 8 9
6 3
Hard #8
2 4
5 8 1 2
5 6
9 4 7 6
4 3 7 2 1
6 5 2 4
8 9 6 7
4
1 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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