Printable Hard Sudoku

Set 311xtc. 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
9 2 5
8 4 1
5 9
5 6 3
1 5 7 4
8 9 7
9 8 1 3 5
5 7
3 9 8 6
Hard #2
1 4
9 4 7 1 8
6 5
4 6 3
2 8 4
3 1 5
5 2 1
2 6 8 9 7
8 3 6
Hard #3
7 5 2
9 5 6 1
4 8 9
1 6 2 3 4
2 7 9
8 1
6 8 4 7 5
5 7
4 8
Hard #4
1 6
5 3
4 9 5
8 5 3 2 7 6
1 2
1 9 5 8
2 3 4
9 6 7 4 8
7 9
Hard #5
6 2 9 5
1 3 9
9 4 8
9 7
2 8 1 3
5 2 8 4
5 4 7
4 1 6
8 6 5
Hard #6
5 4 9
8
3 1 4 7
7 3 2
2 4 3
9 8 5 4 1
1 8 2
6 5 7 3
1 7 4
Hard #7
3 7
8 3 1
9 5 3 2
5 6 3 2 4 7
4 8
4 3 7 1
1
9 5 7 2 8
5 4
Hard #8
4 8
3 6 5 9
6 9 1 3
6 8
3 1 4 7
3 4 8 5
7 5 9 1
8 7 6
1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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