Printable Hard Sudoku

Set 1lm7wdw. 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 4 5
2
1 7 5 2 9 8
7 3 2
2 1 8 3
5 2 6 8
1 5 8 4
7
8 9 1
Hard #2
1 2 4 3 9
5 2
9 4 8
4 8
6 7
1 2 9
2 1 5 4 8
7 9 6
5 7 3 1
Hard #3
9 3 6 4
7 9 8
3 8 5
2
8 6 3 1 9 2
2 4 1
2 4
1 6 7 5
7 9 1
Hard #4
2 5
9 2 8
2 6 5 8 7
7 1
3 2
9 8 4 1
2 1 4
8 7 5 9
4 6 7 5
Hard #5
7 6
9 8 5 3
7 2 3 9 4
3 8 2
6 4 8
6 9 3
4 5 1 9
2 4 3
5 3
Hard #6
9 7 1 2 5
1 3 9
2 9
4 5 8 7
8 2 9 6
3 1 5
8 7 6
6 1 3
5 4
Hard #7
7 9
6 2 5 4
1 5 9 7 6
4 2 8
2 1 9 3
6
6 4
9 4 6 7 5
6 8 3
Hard #8
6 2 7 8 1
1 3 2 7
3 6
1 9 2
9 5 2 3 4
8 3
2 6 1
3 7 4 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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