Printable Hard Sudoku

Set d8m440. 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 1
7 1 6
6 4
1 3 4 2 9
4 6 3 5
5 9 1 3
3 6 8
2 8 4 6
9 8
Hard #2
1 2 6
7 4 8 3
1 7 2
2 8 5 4
3 6
5 4 6
9 6
4 3 5
8 6 5 4 9
Hard #3
1 5 8
8 9 2
4 5 6 7 9
5 6 1 4
4 2
8 2
2 6 8 4 9
6 7 2
9 7
Hard #4
6 7
4 1
5 3 2 9
7 2 5 9 3
3 5 2
2 8 1
7 8 3 1
1 9 7
7 6 3
Hard #5
4 6 3 8
6 2 5
1 5 3 9 7
8 5 1 2
9
9 8
7 2 4
1 5 4 7
2 3 7
Hard #6
8 7 3 1 9 5
1 6
6 5 8 7
9 2 6
4 3 5
5 8 4 7
2 9
6 8 9
3 5
Hard #7
2 5 8 6 4
6 9 7 2
1 7 9 5
2
7 8
4 6 5 7 1 8
1 4 6
5 3 9
7
Hard #8
1 3 8
7 3
8 5 7 9
3 4
9 2 8 5
6 4 8 7 1
7 1 3
4 2 7
2 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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