Printable Hard Sudoku

Set spvck2. 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
5 6 2
7 1 4 2
6 7
8 7 9 5 3
8 2
9 5 3 4
2 6 5
9 3 2
8 4 9
Hard #2
8 6
6 9 7
7 2 5
9 7 1 5
3 5 4 6 8
2 1 8
4 3 9 2
2 4
3 4 6
Hard #3
1 6 9 7
3 4 5
8 4 2
4 2 7
5 9 4 6
3 1 8 5 4 2
4 5 1
5
8 3
Hard #4
6 2 5
4 5 6
1 4 9
1
7 9 8 1
2 7 9
2 5 1 6
3 7 2 4
8 1 9 3
Hard #5
7 6 9 8 5
7
1 4
7 6 4
1 8 2 4 7 6
9 6 2
6 4 8 9 2 7
6
3 4
Hard #6
9 5 3
7
6 4 7
8 5 4
7 1 2 8
3 2 1
2 8
4 7 9 1 6 8
3 6 4 5
Hard #7
3 9 5
6 7 2 8
1 8 4
4 1 9 7
3 5
6 5 2
7 1 4 6 8
8 4
6 5 7
Hard #8
1 5 6 3 2
3 8 2 7 1
5 6
6 2
9 1 5 8
8 9
6
5 2 7 3
7 1 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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