Printable Hard Sudoku

Set 181a1py. 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
7
2 1 6
4 9 2
5 6 7
1 8 4 7
6 8 4 1 5
9 8
3 5 9 4
5 4 9 3
Hard #2
7 2 4 8
1 5
4 2 9 6 5
5 3 6 8
8 4
6 1 9
4 2 8 3 7
2 5 3
1
Hard #3
4 2 9
5 7 1 4 3
6
3 8
6 5 7 9 3
8 3 5
7 2
1 9 4 8
3 2 1 7
Hard #4
9 3 8
4 8 2
6 1 4
2 7
6 2 8 1
5 3 8
7 9 3
1 3 9 7 8 5
2 6
Hard #5
7 9
4 5
2 9 6 5 8 1
8 3 7
1 7 9
4 5 2 6
5 7 1 8 6
5
1 7 9
Hard #6
2 8 6
2 4 5
9 7 4 2
8 5 7
1 9 7 4 3
2 7
7 8
3 2 6
8 1 6 9
Hard #7
3 4
9 6
3 6 2
6 1 7
8 4 5
9 5 8 3 7
8 6 7 5
6 2 4 3
1 4 8
Hard #8
2 7 9 3 6
4 8 1
9 1 6 4
6 5 2 7
7 4 8 5 9
2
8 2
9 7
2 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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