Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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