Printable Hard Sudoku

Set 13dg6a6. 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 8 2 1
6 8
8 7 1 9
8 3 2
7 8 5
4 2 1
2 1 9
7 2 4
9 5 1 6
Hard #2
4 7 8 3
8 3 1 4 9 7
9
9
1 9 6 4
4 2 7 5 1
2 3
8 3 7
1 7 2
Hard #3
4 5 9 1
9 3 7
8 6 4
9 2 7
2 7 1
1 4 8
6 7 9
2 3 1 5 4
8 5
Hard #4
4 8
6 1 9 5
5 3
4 2 5 7
8
5 9 6
2 4 1 7 9
6 8 4
8 7 3 5 1
Hard #5
4 6 2 1 9
6 4 9 5
7 6
8 2 5
3 2
9 3 1
5 4 3
7 8 4
8 9 7 1
Hard #6
9 5 1
6 2 9 4 1
8 3 2 5
7 3 1
8 2
2 3 7 4 9
9 5 7 2
9 3 5
Hard #7
2 9 3
4 6 8
7 3 4 9
4
4 9 1 2 8 3 6
5 6 1 2
3 7 2
4 1 5 2
Hard #8
9 3 5 2 7
8 1 9 4
6 7 9 2 4
5 6
8 1 4
3 8 6
2 5 1 4
3 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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