Printable Hard Sudoku

Set 125whiw. 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 6 9 8
9 8 5
1 5 3 4
6
3 8 9
6 3 2 9 4
9 4 7
2 4 7 8
6 1
Hard #2
1
6 8
1 4 3 2
6 9 2
2 8
2 4 8 1 6 9
8 6 3 4
9 2 1 7
3 2 9
Hard #3
5 3 1
9
7 4 1 8
8
5 8 6 4
3 4 9 6
9 5 8
7 6 4 2 5
6 3 2 7
Hard #4
6 8 7 9 2
1
5 8 3
2 1 8 4
6
3 4 1 2 7
4 7 3 5 9
2 8 3
7 2
Hard #5
2 6 9
3 8
6 9
9 5 3 6
1 4 5 9 2
7 5
4 1 2 8
3 2 7
2 4 5 6
Hard #6
8 9 6 2 3
6 4 3 7
5
6 3 1
4 3 2 9
5 9 3
2 6 3
4 5 2
6 8 9
Hard #7
5 9
1
6 7 1 3 5 8
8
6 2 4
9 4 5 1 3 6
6 8 9
9 7 6 8 1
1 2
Hard #8
5 7
9 2 3
8 2 6 1
7 9
1 8
8 5 4 1 2
8 9 2
5 8 1
3 1 2 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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