Printable Hard Sudoku

Set 1lmt68z. 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
8 5 6 4
6 5 4 2 8
5 1
1 3 4
2 9 6 8
5 7
2 5
6 2 9 5 8
7 9
Hard #2
5 1 2 7
2 5 9 8
8 7 5
7 9 3 1
1 6 5 7
6 4 8
3 4 9 5
1
6 3
Hard #3
3 9 2
6 4
9
8 5 4 1
3 2 7 4
2 9 3 5
2 4 1
3 9 5
8 6 3 7 2
Hard #4
3 6 8
8 7 1
1 3 8 5
6 2
7 5
8 2 9 4 3 5 1
6 9 5
6
4 8 9 2
Hard #5
8 4 9 3
1 5 6
2 1
5 6
8 3 7 2
4 6 2 8 3
8 4 9
7 1 2 3
5 4
Hard #6
2 3
7 1 6 5 2 8
4 9
2 8 3
7 6 5
6 1
2 9 3
5 6 8 2 1
1 7 5
Hard #7
1 6
2 4 5
3 7
6 9 1 2
3 2 9
4 8 1 6
4 3
9 7 8 4 2 6
1 7 9
Hard #8
3 7
5 6
3 6 5
2 1 4
1 8 3
5 8 7 3 1 9
3 9 1 2 6
8 2
1 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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