Printable Hard Sudoku

Set 2out38. 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 3 1
6 2
9 2 8 5
1 8 3 5 7 6
3 7 9
4 5 7 8
8 3 2
5 6 2
Hard #2
9 3 4 6
8 5 2
6 2 1 3
8 2 7 5
6 5 1 4
7 5 6 9
2 5
7 4
4 8
Hard #3
4 8 6
8 2 6 4 5
3 4 2
4 1 9
9 5 2 4
1 4 3
4 2 8 3 1
7
7 6
Hard #4
7
3 2 4 6 8
1 5 6 9
4 2 5 3
8 5 4
6 9
3 1 8 4
7 2
5 8 7 9
Hard #5
7 5 2 9
8 1
6 1
4 2
9 7 6 3
3 8 7
7 2 8
3 8 4 6 1
6 1 7 2
Hard #6
3
1 6
9 6 5
7 1
1 4 9 3
9 7 5 4 2
7 4
7 5 1 2 3
1 4 5 6 8
Hard #7
9 5 3
1 4 5 9 2
2 4 6 7
9 1 6 7 5
7
5 9 1
5 2
8 1 3
6 2 8
Hard #8
8 1 4 5 2
6 4 1
3
4 3 7
3 4 8 2 7
1 3
7 1 4
2 6 9
8 7 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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