Printable Hard Sudoku

Set 19wy4m1. 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
5 1 7
6 5
9 2 5 6
4 5 8 9 2
7 8 5
9 5 1 3
9 4
2 3 9 8
7 6
Hard #2
1 4
2 7 5
4 7 3 1
8 4
7 8 1 4 6
4 9 7
3 1 8
1 8 7
9 5 2 4
Hard #3
6 8 7 2
5 9 6
5
3 5 6
9 1 8 4
4 2 8 5
4 7 9 3
1
9 7 6 5 2
Hard #4
1 3 5 7 8
4
6 4 2 5
2 9 7 1
7 8
5 4 2 9
8 2
4 8 3 7
5 7 8
Hard #5
9 3 1 8 7
2 9 3
1 6 5
6 8 3 1 9
7 3 8
1 5 4 7
5 4 8 2
1
2
Hard #6
7 2 1 9 8
3 7 2 4
8 2 7
3 1 4
5 3 6
7 3
8 6 7 2
5
2 5 9 3
Hard #7
5 9 7
6 2 7 8
6 8 1 9 5
7 8 2
7 4 6
4 6 5
2
4 5 6
8 2 3 4
Hard #8
6 4 8
4 8 1
8 2 9 3
9 1 3
5 8 6
3 5 7
3 7 5
5 7 1 9
3 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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