Printable Hard Sudoku

Set 1l5gk7t. 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 1 8
7 8 6 9
7 1
3 7 6 9
9 2 5
8 5 3 6
5 7 3
8 2 5
4 9 8
Hard #2
4 2 7 9
4
1 7 3
6 5 4 8
6 8
2 5 4
5 9 3 7
7 6 5 8
8 2 1 9
Hard #3
9 2 8 6 1
5 8
4 7 1
5 1 3 8
1
2 9 4 5
9 7 4 6 3
9 4
6 2 5
Hard #4
5 3 1 8 4 7
4 5 9 6
9 5 8
4 8
9
3 8 7 6 9
3 5
1 8
3 6 2 1
Hard #5
3 9
8 1
1 2 9 6
8 5 6 4 2
4 6 7 2 9 5
5 7
7
5 6 7 4 9
2 8
Hard #6
5 3 9 7
2 6 1
7 3 4
1 3
9 4 6 2
2 7 8 1 9
4 1
1 9
2 6 8 4
Hard #7
8 3 5
6 8
2 3 5
2 3 9 6 4
1 4 2
9 6
7 9 8 1
1 8 5
4 7 9 3
Hard #8
1 5 3 8
6 9 7 5
2 3 9
6 5 1
4 8 9 5
8 6 3
8 4
1 7 2
6 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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