Printable Hard Sudoku

Set 70pett. 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
3 4 1
9 3
5 2 3 7
4 9 2 7
9 6
1 2 4 8
1 7 3 2 5
7 5 9 1
8
Hard #2
9 4 8
2 1 7
8 3 1
8 6 9
7 3 8 6
4 9 7 2
3 1
5 6 9 8 2
5 4
Hard #3
4 5 6 9
7 8 3
5 7 4 3
2 9 5
1 5 4
8 5 2 1 7
7 8 4 2
1 8 7
Hard #4
4 5 7
7 4 6
6 2 3 9
1 9 5 3
2 4 3 8
6 8 2 4
5 6 7 9
9
6 1
Hard #5
9 4
4 2 9 8 7 1
8 4
9 1 7 3 8
6 9
5 8 7
6
1 3 5 7
9 7 8 4
Hard #6
3 5 4 8
4 2 7
8 2 3
5 3 9
7 6 3
3 6 1 5
6 5 1
3 8 2
7 8 3
Hard #7
1
7 8 3
6 9 4 5 7 8
3 2 1 7
6 8 9
4 7 9 2
8 2 3
9 2 8 1
4
Hard #8
3 6 4 7 8
9
3 5 2
2 7 6
1 3 8 6 7
4 1 2
6 1
8 2 9
5 9 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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