Printable Hard Sudoku

Set 1ktal9o. 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
1 4 8
9 6
4 1 8
7 6 1 8
5 1 2 3
8 2 6
2 8 4
5 9
1 3 2 6 5
Hard #2
6 3
5 6 8 4
4 2 7 5
1 6 4 3
6 2 8 7
2 1
8 1 7
4 5 9
3 1 8
Hard #3
7 6 4
4 6 1 3 5
8 1 3 6
1 3 4 2
3 7
7 4 9
6 1
6 5 2 8
2 9
Hard #4
2 9
3 7 4
5 8 3 2
8
5 4 1 2
7 9 8 3
6 7 8 9
7 6 4
9 3 2 6
Hard #5
5 2
8 6 2 3
6 9
2 7 8
3 5 4 6
1 4 2
2 3
1 2 4 6 9
8 7 5 3
Hard #6
6 4 5 8
2 9
5 2 3
4 8
3 1 7
8 1 2 7
1 5 9 6
9 4 3 5
6 2 9
Hard #7
8 7
8 5 9
5 4 2 3
1 2
7 9 5 1 8
6 7 3 9
4 1 7 5
1 2
9 2 3
Hard #8
3 7 9 8 5
7 8 3
8 6 4 2 1
6 3
2 1 8 7 4
5 8
2 6
9 3 4
7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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