Printable Hard Sudoku

Set tbkih1. 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 4 9 1
1 3 6 8 9
6
4 5 2
9 4 1 8
9 6 7 1 8 4
8 5
2 9 7 3
Hard #2
5 8 7
6 5 9
2
3 1 9 5
6 8 4 3
9 3 7 4
1
9 6 2 1 7 5
2 6 8
Hard #3
7 5 2 1
8 2
1 9
1 4 5 9 7
9 4 7 8
9
6 3 2 4
8 7 5 3
3 6 9
Hard #4
7 3 6
6 3 1
9 6
8 6 1 3 9 5
3 6 7
9 4 8 3
4 5 1 9
2 7
2 5
Hard #5
3 9 8 5 2
8 9 7 1 3
6
1 4
4 5 7 3 1
3 2 6
2 7 8
3 5
5 3 6
Hard #6
8 1 6
9 5 6 2
7 8 1 4
5 3
4 8 5 2
2 3 9
2 4 7
4
5 8 2 3 9
Hard #7
3
6 8 9 5
9 4 1 5 8 7
2 4 7
4
8 6 2
3 7 6 4
1 2 8
5 9 4 1
Hard #8
2 3 8
1 4
5 3 4
1 5 7 4
3 9 1 5
7 9 2
9 2 7 5 6
3 4 5 1
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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