Printable Hard Sudoku

Set 19luqnm. 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 3 8
2 7 5
9 2
2 8 4 5 6 7
6 8 9
1
2 5 7 4
7 3 8 5
4 2 6
Hard #2
9 8 1
6 4
1 4 5 6 2
3 9 8
7 9 5
6 1 3
8 7 5 4 3 9
2 8
8 7
Hard #3
8 2
2 4 9 7 1 8
7 9 6
5 2 9 8
4 2 1
1 6 5
9 7 2
8 1 2 6 9
Hard #4
4 3
9 3 1 5 2
3 1 2 7
7 5 8 4 1
2
6 1 5 4
3 6 5
1 5 9 2 6
Hard #5
7 6 5
3 9 2 6
3 6 1
8 5
8 7 6 4 3
1 7 9 2
4 8 7
3 1
3 6 1
Hard #6
2 7 8
3 7 9
3 5 4 2
7 2 3
5 2
1 7 5 4
3 6 1
4 1 9
9 8 4 5
Hard #7
4 1 5 2
8 3 1
9 1 6 8
8 7 3
5 7 4
3 1 8 6 7 2 5
7 2 8
1 4
Hard #8
4 3 9 8
1 4 3
9 2
2 6 1 8 7
9 4
7 3
1 2 6
7 2 5
3 8 5 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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