Printable Hard Sudoku

Set nb6kby. 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
8 5 7 4 2
6 2 1 8
3
9 8 5 1 4
4 9 1 7
6 2 9
8 2
5 9
7 1 8
Hard #2
2 3 6
5 8
5 3 6
5 9 1 6 2
7 4 1
9 5
7 8 2 6
8 3 5 7 4
1 9
Hard #3
4 8 9 3
5 3 4 6
2 3 6
1 3 4
4
9 1 4 7
2 5 3
9 4 2
5 8 7 6
Hard #4
9 3 5
4 7 8
2 6 9 1
1 9 7
3 8 6 9
2 1 3
7 9 1 6
3 1
3 2 4
Hard #5
4 1 6
2
7 3 5
5 9 1
4 2 3
1 8 7
7 8 2 3 1
6 4
3 1 7 9 6 5
Hard #6
2 8 4 9 1
3 5
4 2
5 7 2 6 8
2 6 4 5
7 1
6 7 9
8 4 9 6
3 7
Hard #7
9 1
7 1 2
3 2 5 9
7
9 2 6
8 6 7 5 9 2
2 9 6 4 1
6 9 2
1 8
Hard #8
4 9 5 2 7
7 8
2 9 8
4 7 3 2
6
8 1
9 2 3 8 4
2 7
8 1 7 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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