Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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