Printable Hard Sudoku

Set k9tozi. 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
2 3 5 9
7 6
3 4 6 2
1 6 4
1 4 8 5
5 2
1 7
7 3 2 1
4 1 2 7
Hard #2
8 4 2 3
6 9 5 7 4
6
1 2
7 6 8 3 5
1 9 3 6
4 1 7 9
1 6 3
5
Hard #3
6 2 9 3 4
8
9 1 2
9 7
2 5 8 1 9
4 3 2 5
5 4 6
1 4
6 3 9 4
Hard #4
1 5 7
7 5 4 1 6
6 3
1 9
7 2 8 1
5 8 6
2 4 3
3 8 2 5 6
9 8
Hard #5
5 1
6 3 4
4 9 2
1 4 9 2
2 6
8 6 1 5
4
4 5 3 7 8
9 2 5 3 6
Hard #6
4 8 7
1 6 3 9 8 2 7
4
9 4
5 2 1
3 8 6
7 2 8
1 5
2 6 5 4 9
Hard #7
7 1 8 4
3 2 9
1 6
1 6 7
8 9 1 5
5 4 2
4 8 6 7 5
6 9
5 8 6
Hard #8
8 5 1 4
4 1 9 3 7 6
6 9 8
5 7
5 8 4 2
5 4 3 9
7 2 6 8
8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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