Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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