Printable Hard Sudoku

Set 49t15n. 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 2 9
7 1 3
2 1 8 5
8 9 5
6 5 8
4 2 6
8 7 2 1
3 2 5 9
6 2
Hard #2
4 2
1 4 2
9 7 3 6
1 8
6 1 2 4
3 7 8 2
6 2 8 7 1
8 3 4 9
4
Hard #3
4 2 7
3 1 2
2 5 9
1 2
9 3 2
7 8 5 9
4 3 5
7 2 5 4
4 9 1 7
Hard #4
5 8 9
1 7 4 8
3 4
1
2 5 4
2 5 3 1
5 8 1
9 1 2 7
2 6 4 1 9
Hard #5
5 2 8 3
1 4 9
3 1 5
9 6
1 8 7 4
4 7 5 9
2 9 4
5 4 8 3
4 7
Hard #6
3 9 4 7
9 2 1
6 2 9 8
5 1 9
1 6 3
8 6 4
5 9
2 4 1 6
7 5 1
Hard #7
2 3
4 9 5 6 3
5 1 9 2
2 6 7 9 5
1 3 8 7
8 6
6 8
5 2
7 9 1
Hard #8
3 8 4 7
2 4 3
9 5 6
4 7 1 5
5 2
8 5 1
8 2 7 1 9
6 5 2
7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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