Printable Hard Sudoku

Set 15muq51. 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
4 6 8 1 7
3 9
5 3
3 2
6 4 2 1 5
8 9 7 1
7 6 1
3 8 5
7 4 6
Hard #2
8 5 4 3
8
7 2 5
1 3 8
7 6 2 1
1 9 3 2
1 4 6 2 9
2 3 1
5 7
Hard #3
5 6 3 9
1 2 9 7
3 6 4
7 2 5
4 6 9
3 1 6
7 6 3
5 4 8 7
7 1
Hard #4
6 4 2 3 8
7 9 1 5 3
3 1 2
2 3 6
9 7
1
6 9 1 5
5 8
8 7 6 9
Hard #5
5 3 7
1 2 8 9
5 8
4 6 2 9
8 7 9 3
3 1
4 3
8 3 6 9 5
7 4 6
Hard #6
1 6 4 5
9
2 6
6 7 3 1 5
4 6 5 3
2
4 8 9 5 2 3
5 4 8 9
8 2
Hard #7
2 5 7
4 8 9 3 2
1
3 5 4
7 5 4
3 5 6 7
1 4 7 2 9
5 2 9
3 1
Hard #8
4 5 2
8 2 1
7 8
1 4
5 7 6
6 8 9 7
5 6 9
6 1 3 8 4
8 2 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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