Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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