Printable Hard Sudoku

Set 4oo0cu. 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 3 6
5 6 1 2
4 7
1 8 7
8 5 4
7 6 2
9 1 6 8
5 2 1 4 9
6 2
Hard #2
3 9 7 5 4
2 7 8 3
3 4 6
7 9 1 6
8 6 4
9 1
6 8
5 1 4
7 5 1
Hard #3
9 7 8
3 8 6 1
6 7 1 3
8 9 3 7 4
2 9 3
2 9 6
4 2 7
1
7 1 3
Hard #4
3 1
9 4 7 2 5
3 7 9
2 8
5 6 1 2 4
5 6
2 8 7 4 3
5 3 8 7
7
Hard #5
3 6
7 5 8 1
5 4
6 2 5 8 1
1 3 7
7 9 2 5
5 1 4
5 8 7
6 9 4
Hard #6
1 2 4
3 9 5
5 9
4 8 6
3 8 9 2
2 5 1 8
1 4 3 9 8
4 7 3
1 2
Hard #7
6 1 9
1 3 6
7 6 8 5
6 2 8
8 9 2 4
5 4 9
7 8 6
1 8 4 9
7 1
Hard #8
3 2 8 9
1 7 5
8 2
6 4
4 7 6 9
1 3 2
6 8 5 4 9 7
2 4
5 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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