Printable Hard Sudoku

Set 1k5lblr. 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
4 3 9 1
8 7 6 4
9 5 6 7
2 6 7
1 7 8 9
6 3 1 4
1 2 3 5
5 3
Hard #2
1 3 7 9 6
5 6 2 8
2 9 3 7 1
9 7
7 2
2 6 8 4
9 4
8 5
7 3 5
Hard #3
2 7 6
2 6 1 9 5
1 3 5 4
3 4
7 6 8 9
6 8 1 3
8 6
5 2 6
3 8
Hard #4
9 6 2 4 5
8 4 7
1 9 7 8
1 4
7 9
2 3 4 6
7 6 8
2 4
5 3 9 6
Hard #5
9 5 7 1
5 6 2
2 1 8 5
2 8
6 8 2 9
3 4 7 6
8 3 1 6
3 6
9 4
Hard #6
7 2 1
3 1 7 2
3 4
9 8 1 5
4
1 9 8 6
9
9 5 7 4
7 4 2 3 9 5
Hard #7
8 7 1
8 4 9
5 6 2
2 6 4 3
5 3 2 9
8 7 4
6 1 3
9 2
7 1 3 9
Hard #8
1 6
8 3 1
4 2 8 5 9
1 3 8
5 2 4 1
6 3 4 9
2 4 1
1 7 3 4
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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