Printable Hard Sudoku

Set 12x63ip. 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
4 8
9 4 6
1 3 2
4 5
3 5 2 9
8 7 2 5
8 5 9
7 6 3 8
8 1 6 3
Hard #2
4 5 1
6 2 7 4
9 8 3
1 3 2 6 7
4 7 3 2 9
9 8
6 1
6
9 7 6 8
Hard #3
5 2
6 4
2 3 9
7 2 6 8
2 8 7 6
5 4 9
6 8 9
2 9 3 5 7
1 5 2
Hard #4
8 1
4 7 5
5 1 8 6 7
8 1
3 4 6
7 1 4 3 5
3 9 2
6 7 4 9
5 4
Hard #5
7 6 4
8 4 3 2 9 1
9 7 2
8 1 6 5
6 9 5
3
5 2
2 7
3 1 6 9 8
Hard #6
3 7 8
5 4 6 7
4 9 3
3 1 5
2 7 1
1 5 4
1 2
4 6 7 9
1 4 6 8
Hard #7
2 1 3 6
7 9 1 8 3
8
2 6 9
2 9
9 3 5 1 2
4 6 8
5 6 4
3 6 8
Hard #8
7 2 1
9 7 5 3 6 8
2 6
4 5 3
8 7 4 3
6 1
4 5 9 7 3
1 2
7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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