Printable Hard Sudoku

Set 15pie3n. 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 2
2 3 6 1
8 1 5
6 7 8 1 3
2 4 9 7 1
2 6
2 4
4 7 8
6 9 1
Hard #2
7 4 8
6 8 4
5 9 1 6
1 2
6 5 1 3
3 8 2
4 6 1
2 1 7
7 8 9 2
Hard #3
8 4
4 3 1
3 7 9 8
6 2
8 5 6 1
7 2 5
3 2 5 6
5 7 3
6 3 8 5
Hard #4
2 7 4 9
8 4 1 5
7
1 4 5 8
4 3 2
2 8 5 7
9 3 2
4 8 9 3
1 5
Hard #5
4 5 7 8 1
1 6 5
9 6 7 3
2 3 6 9 5
8 7
9 6 5 2
3 8
8 4 6 7
Hard #6
5 2 9
3 1 6
9 1 6 8 3 7
9 6
8 2 6 5
4 2 9
7 2 3
4
3 4 1 7
Hard #7
1 9 3 6
9 8 2 7
7 2 9 1
8 3 5 1 9 4
4 2
5 1
9 6 5 7
4 9 5
Hard #8
2
7 3 4 2 8
8 6 3 9
2 1 8 3
1 4
8 5 9
7 6 3 8 4
8 9 3
4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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