Printable Hard Sudoku

Set ouxs47. 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
5 4 9 7
9 7 4 2
6 7 8 9
1 2 9
2 5
8 6 9 3
4 8 6
6
2 7 3 1
Hard #2
9 4 7
1 4 9 7 3
5
2 7 5 3
2 9
4 3 6 5
5 9 1 4 6
8 5
6 2 9
Hard #3
9 1
5 2
6 5 3
9 1 8 2 4
2 9
2 3 5 8 1
5 4
8 7 9 5
2 7 4 9
Hard #4
1 2 7
7 3 5 9
8 4 3
5 7 2 6 8
7 6 9 3 4
5 2
7 9 8 4
1 2 8
Hard #5
6 1 8
8 7 9 3
1 3 2 7 4
4 3 2 5
9
7 8 4 6
2 4 8 3 1
9 8 7
Hard #6
1 4
1 7 6
6 3
3 5 1
7 8 6
8 9 7 2
1 4 3 9
6 8 4 2
5 9 6 7
Hard #7
3
5 8 3 2
6 9 4 1
8
5 2 3 4
1 7 9
3 1 8 7
2 8 4 7 5
6 3 5
Hard #8
4 1
4 6 3 9
7 4 8
7 8 4
5 2 6 3 1
8 1 5 9
3
4 9
7 5 6 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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