Printable Hard Sudoku

Set 64umvb. 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 5
7
2 9 1 4 6
1 8 3 9
7 4 1 9
6 5 1
9 2 5
3 6 7
4 7 6 2
Hard #2
6 5 4
2 4 8 9
5 4 1
4 7 8
6 8 3
9 2
5
6 1 7 2
7 1 8 9 2 6
Hard #3
1 3 7
8
9 1 5
8 3 5
4 7 1 9
1 8 6
5 1 4 6 2
4 6 2 9 3 1
7
Hard #4
5 1 7 8
3 6 5
2 3 1
7 9 3
4 1 8
8
7 5 9 6 3 4
4 2 6 8
6 5
Hard #5
2 4
7 3 8 9
3 6 9 7
2 4 7 5 3
3 1
4 5 2
7 5 1
3 6
5 8 6 2
Hard #6
1
5 8 4 2
3 2
7 3 2 1 8
6 7
1 5 8 7 9 3
2 8 9 6
9
5 3 4 7
Hard #7
5 4 7 6
7 9 5 4
3 1 5 2 8
7 2 8
3 9
8 1
8 3 4 1
4 9
8 5 7
Hard #8
9 5 3 1
8 7 5 6 3
9 4 5
4 7 6 3 9
3 6
3 2 5
7
2 9
2 9 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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