Printable Hard Sudoku

Set ta0jiu. 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
1 5 9
9 7 4 1 8 3
8 7 6
3 7 6
7 9 1 8
7 2
5 2
6 8
7 8 5 1
Hard #2
4 9 3 2
6 5 9 7
7 4 5
1 4 2 9
7 6 9
8 7 2
8 1 9
6 8
4 3 2
Hard #3
3 6 2 9
4 7 2 6 8
5 7
1 6 3 2 9
4
4 8 7 2
3 9 8
1 7 5
3 9
Hard #4
2 5 4 7 1
3 8 7
1 5 6
3 9 6 5 8 2
4 9
1 8 2 7
1 7 3
7 4
6
Hard #5
4 3
6 3 9 8
4 8 9 1
3 1 9 5
5 9 4 3
2 4
4 2 5 3
7 3
1 6 2
Hard #6
6 7 8 3 1
1 7 6
9 5 4
8 9 3
3 6 8
9 6 4 5
4 1 7
2 4
6 1 3
Hard #7
8 1 6 3
2 5
6 2
9 2 1 3 6
5 9
8 4 9 1
7 3 5 1
5 4 9 1
9 6
Hard #8
9 7 6
5 3 2
2 6 9 1
4 9
2 1
3 4 9 7
1 8 3
6 9 8 7
2 9 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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