Printable Hard Sudoku

Set 1i8f0jg. 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
3
6 9
8 2 1 4 3
1 5 6 3
7 5 8 2
6 2 7 1 8
1 6 3
3 4 2 1 7
Hard #2
5 1 3
9 4 1 2 8
8 5 7
4 9
1
6 9 1 8 5
5 6 3
9 4 7
7 9 6 2
Hard #3
2 5 3 6
3 6 1
6 1 2 5
8
1 3 2 5 8
7 1 6 9 2
2 3
7 4 8
9 1
Hard #4
5 2
4 3 5 6 8
9 3
7 8 4
2 1 6 5
4 8 1 3
7 9 1
5 6
1 9 8 4
Hard #5
7 9 1
9 3
5 3 2
8 5 9 1
1 3 2
7 8 9 6
7 3 4
3 7 1 6
4 7 8
Hard #6
7
8 5 1 7
9 2 5
6 7 4 8
4 5 3 7
5 3 6 7
9 6 2
1 7
9 6 4 2
Hard #7
5 3 8 1 7
5 1 8
1
5 1 3
9 2 1 8 5
2 9 6 1
9 7 6
7 4
6 1 9
Hard #8
7 9 4
4 9 8
8 1
2 6 4 8
8 9
8 7 2
2 5 6 4 7
1 4 3 6 9
5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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