Printable Hard Sudoku

Set 18b3bvt. 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 4 9
2 3 5
3 8 7 9 6
9 4 6
5 8 2
1 9 8 5
9 7 1
2 4 7 5
Hard #2
3 7 4 1
7 5 4
1 8 5 3
1 6
3 9 1 8 6 7
9 1
5 3 8 1
6 3 7
9
Hard #3
9 1 8 2
7 9
6 4 9 7
3 1
4 2
1 4 7
6 1 9 8 5
9 6
7 8 2 6 9
Hard #4
6 2 7 3
2 8
6 3 4 5
7 6 1 4
8 3
1 5 3
9 7 5 6
4 8 5
5 7 4
Hard #5
8 7 4
2 3 7
9 8
2 7 6 5
5 8 1 9
3 8
6 1
8 6 2 5 4
5 8 1 2
Hard #6
4 2
1 2 8
1 5 4 9
8 5 3 2
7 4 1 5
9 3
9 7 4
4 3 5 7
7 8 6
Hard #7
3 9 7
5 8 1 4
6 1 2 3
6 1 2
7 6 8 9
2 6
4 6 5
3 5
1 6 7 4
Hard #8
1 5 9
9 7 4 1 8 3
8 7 6
3 7 6
7 9 1 8
7 2
5 2
6 8
7 8 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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