Printable Hard Sudoku

Set 151mo3i. 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
1
1 7 5 9
6 3 2 5
8 3 6
4 6 3
7 9 5 4
5 7 3
1 6 3 9 7
9 4
Hard #2
6 1 5
5 7 4 9 8
8 2
5 4
8 3 7 5
4 1 9 8
6 8 3 7 9
4 3
3 6
Hard #3
1 7
9 2 4
6 3 5
9 1
2 7 8
2 5 6 1
4 3 1 6
6 1
4 5 3 2 9 8
Hard #4
8 2
9 2 7 3
4 2 3 9 8
5 4
8 1 2
1 3 6 5 9
6 8
9 5 7 1
1 7
Hard #5
4 2 8
7
4 6 2
4 9 2 8 6
7 2
7 3 9
9 1 5 4
4 3 9 1
7 2 8 6
Hard #6
2 5
7 5 3 4 2 9
4 9
6 7 1
9 3 5 6
1 9 4
6 2 4 9
5 7
3 7 6
Hard #7
7 3 8
5 2 4
7 9
8 7 1 6
2 9 8 4
1 7
2 9 8 3
6 5 4 7
8 6 2
Hard #8
1 8
9 8 2 6 7
2 6 1
8 6 5 4
7 9
1 9 4 8
9 5 8
1
3 9 5 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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