Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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