Printable Hard Sudoku

Set kai98h. 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 4 2
6 2 7
2 8 4
3 9 7 8
4 1 8 9 3
8 2
5 3 1 7
2 8 9
5
Hard #2
3 4 5 6
6 5
9 8
2 5 9 4
5 1
4 3 1
6 9 1 7
3 7 5
2 7 1 8 3
Hard #3
7 5 8 6
1 4
7 1 5
3 7 4 8 5 1
9 2 7
1 3
9 8 5 1
4 6
6 7 9
Hard #4
6 1 8 3 2
8 2 3 1
9 4 7 6
8
5 4 1 6
4 3 5
9 5
6 2 7
1 7 4
Hard #5
8 1 3 7 6 5 9
9 2 8 5 3
6 1
4 2
3 5 6 1
4 5 7
9 4 5
6 8
4
Hard #6
6 5 1
5 7 4
3 8 9 2
5 1 3 4
9 2
3 7 6 5 9
2 8 4
3 9
4 1 5
Hard #7
6 9 8 2 1 5 3
9 8
3 6 7
9 7
8 3 5 2
5 8 9 1
1 2 7 8
1 3 7
Hard #8
7
8 1 2
8 5
2 1 4 9
4 8 6 2 1
1 4 2
2 4 7 6
6 5 8
9 3 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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