Printable Hard Sudoku

Set 8xm8oy. 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 6 4
7 4 3
7 6 2
6 5 3 7 9
2 5
3 8 2 5
4 6
8 9 1
3 2 9 8
Hard #2
6 1
9 7 4
6 2
8 2 5
7 4 8 1
5 8 1 6
2 4 9 3 7
8 9 2
3 8 9
Hard #3
9 1
3 8 7 2
8 2 6 9
1 5 2
4 8 1
2 3 4
4 2 9 6
9 7 6
7 2 3
Hard #4
1 6 2 7 8
7 3 4
4 5 6
1 2 3 6
7 3 8 6
4 7
4 5
1 4
9 6 1 2
Hard #5
7 3 5 8 6
2 1 9
3
8 2 6
3 5 2
9 7 5 2
7 6 3 2
4 7 1 5
9 3
Hard #6
8 4 1
2 3 5
5
6 7 1 4
4 8 3 5
4 5 8 3 6
7 1 5
2 5
2 6 9 7
Hard #7
9 4 5 6
3 9 2
2 3 7 8
3 5
9 5 4 1
7 8
8 4 3 7
3 1 2
1 8 6
Hard #8
5 9 4 8
1 4
4 8 2 3
1 6 9
8 3 4
9 3 5 4
5 6 7
5 4 8
6 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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