Printable Hard Sudoku

Set 19d27vv. 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 2 4
6 5 1 7 2
4 8 1 5
1 6 9 2
6 7 9
3 9 4 2 5
3
4
2 6 4
Hard #2
1 9 5
4 8 2
3 2 6 8 4 1
2 5 4 9 1
1 5 7
3 7
9 7 3
5 1
4 6
Hard #3
8 5 6
9 5 8
6 1 3
5 8 1 2
4 2 8
7 3 6
1 6 4
2 3
1 9 8 5 7
Hard #4
6
2 9
4 1 3 8 7
6 8 3
2 4
5 2 9
6 8 3
9 3 7 1 6 4
2 1 4 7
Hard #5
1 7 5 2 8
9 2 5
6 4 7
5 6
2 8 1 5 4 9
5 6
1 7 4 6 3
8
4 1
Hard #6
6 9 8 1
3 9 6 4 5 8
8 1 2
5 4 9
9
6 3 8
4 6 3
5 9
2 8 7 1
Hard #7
7 2
8 3 4 5
2 5 3 8 4
8 9 2
7 9
1 9 3
3 6 2
1 9
6 9 2 3 4
Hard #8
2 4 3 8
5 1 3
8 1
9 2 5
6 3 4 5 9
4 7 2
2 6
7 9 4 5
6 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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