Printable Hard Sudoku

Set 1mf123f. 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
6 2 4 9
9 7 8 6
8 4 7
9 1
7 4 9 8 3 2
8 5
6 1 2
5 7 4
4 2
Hard #2
7 8 2
1 6 3 2
4 7 5
7 4 8 1 5
9 5 1 4
9
2 5 7 8
7
2 6 4 1
Hard #3
1 6
6 9 1
4 3 7 1
5 2 3
8 7 6 1
6 4 7
4 3 2 6
2 4 5 1
7 8
Hard #4
9 7 6
7 1
2 1 6 4 9
8 1 9
6 5
9 8 5
3 6 5
9 7 3 1 4
6 1 3
Hard #5
3 4 1 7
1 6 7 9 4
6 5 1 9
3 5 4 8 7
8 2
4 7 5 9 2
6 7 9 4
Hard #6
8 4 7 2 3
5 9 1 7
6 3 9 4
1 5 6
5 2
2 4
3 9 4 8
4
1 6 7 9
Hard #7
9 4 7 6
4 3 7
1 8 3 9
8 9 3
2 5 3 7
3 4 6 2
4
9 5 2 8
3 6
Hard #8
2 1 8 7 5
9 3 1
8 6
8 3 4 5 7
1 7 4 2
6 9 8
9 2 3
1 8
5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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