Printable Hard Sudoku

Set 1kmox8b. 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
6 9 2 3
3 5 9
4 2 7 1 5
8 6 1 4
3 6
6 7 5
7 9 4 6
5 3
2 9
Hard #2
4 8
6 5 3 9 4
5 7 1 2 8
4 7 1
9 2
5 1
3 6 9 4
2 4 3
1 7 2
Hard #3
8 7 5 3 9 2
9 5
9 8 6
4 7 3 8
9 4
1
3 2 4 5 7
1 9 6
6 5 3
Hard #4
7 9 3
3 5
2 1 8 7
8 2 9 1
6 7
1 4 6 9 8
6 8 7 4 2
8
3 6 4
Hard #5
4 8 3
1 4 9
3 1 6
4 6 3 1 9
1 7 8
9 3 4 5
1 5
3 2 6
8 3 5
Hard #6
3 5
9 4 6
8 9 2
6
8 7 4 5 1
1 3 2 6 7
1 9 6 4
2 6 8 7
3 4
Hard #7
7 3 9 1
4 5
9 7 2
3 5 6
6 9 1 3 2 7
4 8
4 8
9 4 5 2
3 2 8
Hard #8
1 4 9
5 4
8 3 9
2 4
5 8 6 7 3 2
3 7 1 2 5
6 3 1
6
5 6 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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