Printable Hard Sudoku

Set oqfl4i. 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 6 5 2
2 9 4 3 5
6 9 4
3 1 7 6 8 2
1 5 6
3
9 3 5
4 1
4 8
Hard #2
6 2 7 9
6 5
3 8 2 4
4 6 1 7
2
5 9 4 2
4 2 5
6 3
1 4 3 8 7
Hard #3
3 5 1 2
4 8
6 8 1 4
8 5 3
4 1 9 8 3 5 7
4 6 9
2 9 8
4 2 5
Hard #4
1 6 4 2 5
5 4 8 1
8 1 5 3
7 6 9
1 5 4 7
8 3
6 9 8
8 3 5
4
Hard #5
1 6 9 2 3
7 8 2 6
3 7 4
5 3 2 7
6 2 4
6
5 3 6 9
4
8 9 3 4
Hard #6
4 5 1 7
6 7
9 8 4
2 3
3 2
1 9 6 4
8 7 5
2 5 4 9
7 9 5 6 1
Hard #7
2 1
5 6
3 5 8 7
3 8
5 4 1 8 7
8
4 1 7 6 5
2 7 4 1
9 5 4 6
Hard #8
5 1 3 7
6 8 9 3
2 9 6 8
9 3 2 4
7 8 2 5
7
7 6 1
9 5
8 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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