Printable Hard Sudoku

Set xxtk5. 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 7 2 1
9 7 8 4
9 3 4 1
1 7 8 5
6 2
8 6 5
6 9 4 1
9 3 8 6
Hard #2
6 7 4 9 3 2
5 7 3
3 9 8
2 5 9
7 3
3 5 2 1
1 4 5 7
5 7 6
9
Hard #3
3 9
4 2 1
7 9 4 3
6 1
9 4 2 1 8
8 9
1 8 2
1 8 6 4
4 7 8 1
Hard #4
6 7 8 1
8 4 2
1 3 8 2
3 7 2 6
6 1 7
7 9 4
4 5 3
2 5
2 8 4
Hard #5
4 7 6 3
3 4
2 3 5 6
5 9 2 8
7 8 9 3 1
7
1 8 7 4 6
3 2
8 4
Hard #6
3 5 1 9
8 2 7 5 4
6 3
7 4 1
4 2 7
3 4
2 5 7
8 6 7 2
5 9 4
Hard #7
1 6
5 7 9 4
4 6 2
1 4 5 3 7
5 3 6 1 2
9 2 5
3 1 4
8 6
2 7
Hard #8
4 8 9
9 1 6 8 4 7
8 3 1
5
5 1 3 4
8 1 6
3 7 6
1 3 5
6 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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