Printable Hard Sudoku

Set 108rhwa. 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
8 2 1
3 5
7 1 5
3 6 2
2 9 6 7 3
5 4
4 6 7 1
1 9 4 5
7 3 9
Hard #2
6 1 9 4
5
9 1 5 8
6 1 3
7 3 9 8
1 6 9 2
2 7 8 3 9
5 4 7 6
Hard #3
3 5 8 2
5 4 7
1 9 2
2 9 1 8
7 8 5 2 6
5
2 1 3
7 9 8
2 3 4
Hard #4
9 8 7
3 4 1 5
8
4 6 9 1 2
6
2 6 3
5 2 6
1 2 4 9 5
9 1 2 4
Hard #5
3 1
6 9 4
7 1 9 4
7 6 1 3
6 5 7
4 7
7 6 2
5 6 8
3 9 7 4 5
Hard #6
7 5 8
9 6 7 1
7 6
8 2 1 3
9 2 6 3
1 9
5 2
6 3 1 7
2 4 8 5
Hard #7
4 8 5 2
3 6 4 9
2 3 1 8 6
2 6 9 7
5 1
1 9 2
6 7
7 5 4
9 4
Hard #8
6 9 2 3 8
3 5
5 7 8
2 7 4
9 7 2
4 8 3 6
6 4 2 5
1
4 2 8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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