Printable Hard Sudoku

Set 80ep70. 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
5 6 8 1
9 4 3 6 5
3 9
8 1 4
7 8
6 4 9 2
1 2 5 7
9 3 5
Hard #2
1 3 6
8 4 5 7
7 6
1
1 9 8 4
2 4 1 5 3
6 7 8
2 6 4
4 8 7 9
Hard #3
5 1 8
2 6 3 1 9
8 5 9 2
7 5 6
2 3
8
3 1 5 6 9
8 5 4
2 7 8
Hard #4
8 5
3 9 5 1
6 4 3
6 5 4 9
4 2 3 1
2 7 4
7 1 6 2
3 1 6 5
9
Hard #5
7 4 6 1
8 5 6
7 9 4
9 1 5 6 8
3 5
6 4 9
2 7 4 1
2
9 4 5 7
Hard #6
1 2 5 8
8 4 5 9 1
8 3
3 7 2
5 4 7
8 1 2
3 2 6 9
9 1 3 7
3
Hard #7
4 2 8 7 6
9 2
6 4 8 9
4 7 8
5 9 3
8 9 1 2 4
2 5 8
5 6 4 3
Hard #8
2
3 7 9 6
7 5 6 8 3
9 1 2 4 5
5 2 1
8 1
5 4 3
7 3 5
1 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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