Printable Hard Sudoku

Set 2x85k9. 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
1 2 4
1 2 3
8 9 7 6
3
4 8 9 1 3
7 3 4
2 5
3 2 1 6 9
9 7 8
Hard #2
4 5 2 7 8
7 5
1 2
5 6 1
2 6 3 9
7 6
3 4 9
2 9 5 6
6 8 3 4
Hard #3
5 8 4 7 9
7 4
4 6 5
2 8
9 7 2 8 1
6 1
2 9 3
3 5 1
8 7 5 6
Hard #4
5 1 8 4 2 6
3 4
6 1
1 6 9 2
6
2 4
4 9
2 5 1 8 6 4 7
8 5 6
Hard #5
1 6
1 9 6 7 3 2
3 8
2
5 6 7 8 2
6 3 5
2 1
7 9 8
1 2 4 8 7
Hard #6
8 3 6
1 8 9 4
4 3 6 2
3 9
1 7
7 8 6 9 3 5
2 3 5 6
9
9 2 7
Hard #7
7 9 5 4 2
1 4 3
6 7 9
6 8 5
5
8 3 2 5 7
7 8
2 8 3 5
6 4 3
Hard #8
7 5
1 4 8
6
6 3 1
9 7
9 5 7 1 8
6 4 7 8 1 3
5 8 1 2 7
4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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