Printable Hard Sudoku

Set jicpu1. 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
2 9 6 3
8
5 3 6
5 2 3 9
7 1 8
4 2 1
5 8 9 2
5 1
8 3 4 1 6
Hard #2
2 5
7 6 9
8
6 8 9 4
9 6 3 8 1
8 4 7
4 6
2 3 1 8
1 2 7 5 9
Hard #3
3 6 4
2 3 7 5
9 1 6
8 7 5
5 2 1
1 8 7
8 5 9
7 4 3 8
2 5 7
Hard #4
5 1
6 3 2
1 9 8
2 6 5
7 9 3
1 4 9
8 3 6
7 9 4 3
1 5 9 8 3
Hard #5
7 1 4 3
3 9 4 8
4 5
1 3 6
1 4
4 7 1 6
2 9 8
9 7 3 1
8 7 6
Hard #6
7 1
8 6 5
7 3 5 9
1 9 3 8
2 9 3
3 2
3 1 8 7
9 6 3 1
4 6 8
Hard #7
8 9 1
6 2 1 3
9 7 3 5
7 1 4 9
5 7 8 6
9 6
4 5 6 3
4
5 8 9
Hard #8
5
6 2 9 4 5
4 9 6
6 7
8 2 7
9 1 5 2 6
2 1 3
6 5 9
9 8 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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