Printable Hard Sudoku

Set 9kef0w. 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 8 4 9
8 9
5 9 2 4 7
5 6 4
8
3 4 2 1 6
3 4 1
9 6
1 2 7
Hard #2
5 8 6 3
2 3 7
1 5 2 9
8 9 3 4 6
6 1 4 8 3
2
9 2
8
4 9 8 7
Hard #3
1 6 3 7 4
3 5
2 4 7 8
7
5 8 9 1
9 8 2 7
5 4
1 8 2 5
4 9 6
Hard #4
1 7 6
8 2 6 5 9
5 6 1 8
3 1 7
5
7 9
6 5 7 9
4 7 3 6 2
4 5
Hard #5
3 5 8 9
9 5 4 2 1
2 3 5
5 7 2 4 3
9 1
7 3
9 3
1 4 8
6 7 8
Hard #6
7 8
6 3
1 5 9 2 8
8 1
4 9 8 5
4 1
2 4 9 5
8 6 5 3
9 3 1 7
Hard #7
9 8
5 3 8 4
7
8 4 6 5 9
2 6
9 7 2
7 9 5 3
2 3 5 1 7
9 4 2
Hard #8
3 1
4 6 9 5 2
5 7 8 4 3
7 3
7 4 6 1 3
8 1 6
6 2 8
2
3 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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