Printable Hard Sudoku

Set oupn8. 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 6 4 9
9 5 3
1
8 1 2 6 5
8 1 9
7 5 8
8 6 2 3
8 1
5 3 7 2
Hard #2
6 3 7 5
3 4 9
1 6 8
4 3 2 7 9
9 2
7 8
9 3 8 7
8 7
7 1 4 6
Hard #3
6 4 3
1 8 7 6
5 7
3 2 1 8 9
8 2 3 1
4 5
4 3 1 7
3
7 6 5 2
Hard #4
4 3 5 2
3 4
8 6 1 7
5 7 2
2 3 1
9 1 5 2
5 9
8 1 6 4
7 3 8
Hard #5
1 5 4
9 5 3 2
8 1
3 2 6 5 1
5 8 7
6 5 2
6 2
3 7 5 4
5 8 2
Hard #6
7 6 1 5
4 9 6 3
8 4 7 6 1
4 2
5 6 3
8
2 5 1 4
4 3 2 6
7 5
Hard #7
4 1 5 9
3 4
3 9 1
7 8 2 1
6 3 5
2 6 7 9 8
5 6 9 8
8 7 2 6
Hard #8
9 7
8 2 5
6 1 9 7 8
4 7 1 8
5 2
7 3 9
5 1 7 9
4 1 2
3 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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