Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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