Printable Hard Sudoku

Set 1l5f2fg. 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
2
6 5 2
6 9 3 1
8
5 4 9 7
5 3 7
1 7 5 3
8 5 2 9
9 4 3 1 8
Hard #2
5 1 7
6 3
3 6 9 5
6 5 3
2 3 7
1 3 8 9
9 4 8 5
4 2
4 6 8 1
Hard #3
7 6 9
2 1 8
9 2 8 7 3
7 2 4 8
4 3 7
3 5 7 2
1 2 7
4 6
6 5
Hard #4
5 3 2
2 1 9 6
9 5 6 3
4 9
8 7 5
9 3 1 4
7 6 4
9 2 5 8
4 2
Hard #5
5 7 1
5 4 6
1 4 8
2 9 1 3 4
8 6 1
7 8 2 9
5 6 7
3 9 7 5
9
Hard #6
3 7 8 4
8 9
7 6 5
9 7 6 8 5 2 3
2 4 7
1 2
2 8 1 9
8
7 2 4
Hard #7
4 1 5 7
6 1 3
8 3 7 6
7 8 3 9 6 4
5 3 4
4 2
7 1
5
6 4 3 9
Hard #8
7 5 2 6
8 9
9 4 2 7
6 7 4
2 5
4 8 9
3 6 7 2
2 1 6 3
8 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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