Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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