Printable Hard Sudoku

Set 10uds2a. 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
7
9 3 6
3 6 5 9
4 8 6
9 3 4 2
2 3 1
3 4 5
2 5 3 8
9 5 1 4
Hard #2
8
3 1 5
1 9 5 8 3
7 9 6 2 5
1 7
6 3 9
2 5 7 6
6 2 8 4
8 4
Hard #3
4
6 5
2 7 5 9
8 1 9 2 3
3 7 4
1 5 7
9 8 4
5 6 7 4 1
6 2 1
Hard #4
1 6 4
9 1 7 6 8
7
4 2
6 2 1 3
2 7 9
5 9 2 8 7 6
3 5
7 4 9
Hard #5
4 8 1
8 9 6
8 7 9
4 8 3 1
3 1 8 4
4 6
1
6 7 2 9 3 8
5 7 2
Hard #6
7 9
2 4 9 7 1
9 1 7 2
4 5 7 3 6
8 5
3 4 7
7 5
1 6 9
1 2 4
Hard #7
5 8 1 7
8 1 3 4
1 7 4 6
7 3
2 1
3 1 7 9
6 8 5
8 1
7 9 8 1
Hard #8
9 5 8
1 6 5 4
3 7 9
4 2 8 3
5 1 7
8 4 1
6 5
3 2 6
3 4 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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