Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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