Printable Hard Sudoku

Set 1og6ui7. 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
1 5 3
4 9 1
9 7
7 5 6 8
9 3
5 8 2
6 8 4
4 3 1 5 6 7 2
7 6
Hard #2
3 5 1
2 1 9 6
8 3 2
4 8 1 9
2 1 6 7
5 2
1 4 8 6
1 2
9 1 5
Hard #3
7 5
2 1 8
2 9
1 6 2 9
3 8 7
6 5 3 1 8
3 4 2
5 6 4 1
4 1 7
Hard #4
8 9 2 6
2 1 6 5
4 7
6 9 4
3 9 1
9 3 4 7
6 7 4 5
5 8 1
9 8
Hard #5
7 8 5 9
7 6
9 4 3 1
8 5 3 6 7
4
3 5
9 3 2
5 1 9 3
8 2 9 6
Hard #6
3 5 7 2 9
9
1 6 3
8 7 3 6 1 4
6 8 1 9
4 5 9
2 9 8
6
5 3 6
Hard #7
9 8 2 3
6 3 4 8
8 9
2 4 6 8
6 5 7
1 2 9
7 9 6
4 2 5 9
1 2
Hard #8
9 8
8 6 2 4 5
5 6 8 7 1
7 3 5
9 5 4 7
2 8
8 1
4 1
6 9 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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