Printable Hard Sudoku

Set 6ssz0g. 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
7 6 2
8 7 1 9
9 4 3 5 7
4 6
7 9 6 3 5
5
2 3
4 8
8 7 6 9 2
Hard #2
2 3 4 6 9 5
1 5 8
7 2
3 6 7 5
7
5 2 4
9 1 3
6 4 1
6 4 9 5
Hard #3
9 5 7 4
1
6 1 3
7 9 8 1 5 4
1
4 5 8
9 1
3 4 6 2
8 7 3 4 9
Hard #4
2 3 8 1 6 7
7 5
6 7 3 5
3
1 9 2 5
5 4
6 2 7 9
4 1 9
7 2 3
Hard #5
7 5 8 3 6
8 7 4
9 6 5 8
9 3 2
2 6 4 5 3
8
3 7
2 9 5
4 7 2
Hard #6
8 3
2 7 9 5
6 9 4 2
6 7 1 3
3 6
4 2 5 1
3 1 7 8
2 3
6 5 3
Hard #7
1 3 7 2
9 4 1
5
6 4 5 8 1
8 1 9 2 6
9 7
5 4 6
9 2 1 7
8 4
Hard #8
6 4 1
1 2 4
5 9 7
3 6 7
6 1 8
4 3 1
8 7
2 3 4 6
6 4 5 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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