Printable Hard Sudoku

Set 178gijk. 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 2
7 5 4 9
3 8
2 1 8
9 4 7 1 2 3
5 6
8 6 5 7
1 2 6
7 4
Hard #2
6 7 3 9
9 1 7
3 2 5
8 2 4 9 6
3 7 2 6
6 7 2 8
4 8
7 5
5 1
Hard #3
1 2 8
3 6 7 2 1
4 3 5
1 6 9 2
7 4 6 2
8 6
7 4 5
4 7
2 8 3
Hard #4
5 7 1 9
4 8
6 7
3 2 6 9
1 5 6 4 7
7 3
9 4 3
6 5 3
3 2 1 6
Hard #5
7 6 2
3 7 1
1 5 4
8 7 5 3
5 3 9 6
6 3 8 9
4 6 7 9
2 5
1 3
Hard #6
6 7 8 1 2
1 9 3
9 1 2 3 6
5 3 8
2 6 5 7
4
4 9 2
9 8 4
6 7
Hard #7
4 7 8
1 3 4
8 5 9 6
8 4 9 5
9 8 1
4 1 3 8
9 6
2 1 9
7 3 2
Hard #8
5 9 4
7 9 8 6 2
3 6
4 2
3 7 5 6
7 3
1 2 6 3
5 7
6 5 3 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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