Printable Hard Sudoku

Set 1ec7dkr. 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
3 1 9 2
2 4
8 3 6
6 4 3 5 8
5 9 4
5 7 3
8 3 7 1
6 3 9
2 1
Hard #2
1 8 3 4
3 6 5
4 8 9 7
2 6 3 9
9 2 7
8 7 1
4 6 5 8
6
3 7 1
Hard #3
7 2 8
6 4 1
9 3 7 2 5
7 6
8 2 9 4
5 2
5 2 4 9
3 5 2
9 5 1
Hard #4
7 5 4 6
2 3 5
1 2
8 2 9
9 5 8
1 2 7 6 8
3
9 6 7 3
2 6 5 8
Hard #5
2 7 5
8 9 2 5
8 6 1
3 6 9 4 2
6 8 4 7
9
2 4
5 7 1
1 8 7 6
Hard #6
9 3 1 7
4 2 3
7 9 1
1 3
8 2 5 1 4
4 9
6 8 4
9 5 8 6 1
8 1
Hard #7
5 1 8
1 2 9 4
4 5 3 7
7 9 1 2 4
6 7 3
1
9
9 1 8
4 1 7 3 6
Hard #8
5 2 9
5 1
6 8 7 2
4 9 6
8 7 2 5
3 1 5 7
1 4 6 5
4 6
8 7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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