Printable Hard Sudoku

Set 13smg37. 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 3 2
8 3
9 2 4
3 9 1 7
4 3 9 2
6 8 9
1 9 6 5
6 9 8 4 1 2
Hard #2
6 5 9 2
3 7
1 6 2 8 4
7 3 9 6
2 9
5 8 3 2
8 3 1 6
1 9
2 7
Hard #3
7 1 2 5
6 3 2
2 1 6 4
7 1
7 9 2 8
1 3 5 4
5 3 2
4 8 5
3 9
Hard #4
9 5 3 8
3 2 5
8 9
1 6 4
4 9 8
2 6 9 5 1
9 4 2 5
8 1 4
3 1
Hard #5
9 7
3 2 7 1 6
7 4 2 5
4 9 2
3 5
2 1 4 8
2 6 7 3
3 4
8 9 6
Hard #6
3 5 1 9
4 3 7 6
6
3 4 8 5 1
1 7 5
4
1 8 3
9 6 8 5
8 9 2 7
Hard #7
9 1
4 3
9 6 2 4
4 2 7 8 5
2 7 9 3 4
3
2 1
7 5 8
6 8 9 7 3
Hard #8
4
9 3 8 2 6
4 6
2 4
1 6 4 5
7 5 4 1 8 9
3 2 7 9 1
7
9 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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