Printable Hard Sudoku

Set wavuo4. 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 3 9 8 4
2 9 4 7
4 6 8 9
6 8 2
4 9 7 2
3
4 1
9 5
7 6 3 9
Hard #2
7 4
2 3 5 8 9
6 3 5
5 6 9 4 7
3 9
2 6 8
7 5 3 4
7 4 1
8 6
Hard #3
3 5
3 9 2 4 7
7 1 4
5 3
9 1 2
8 2 9 5
8 5 1 3 9 2
7
6 2 8
Hard #4
3 1 2
5 6 4 7 3
2 1 4 6
4 3 1
9 4
7 2
4 3 2 6 9
3 5
8 5 3
Hard #5
2 5 3 1
1 2 8 4 5
7 9
4 7
1 5 6
3 1
8 9 1 4
5 4 8
1 6 4 8
Hard #6
2 7
7 6
3 8 9 7 1
9
8 3 2 5
4 3 1 2
6 5 7 2
5 8 1 3 9
5 4
Hard #7
6 9
5 8 7
1 8 5 7 4
5 6 4 7
6 7 1 2
3 2 5
9 7 1 4 2
3 2
8
Hard #8
3 9 1
7 8 6
6 2 1 8
3 7 4
5 4 3
1 9 2 8
1 9 2
2 3 7 1
6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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