Printable Hard Sudoku

Set 12mk0g0. 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 2 1 7 8
2 8 3
5
4
1 9 2 4
2 5 6 7 1
8 9
1 5 3 4
4 2 5 1
Hard #2
9 8
5 9 2 1
3 5 9 2
7 5 3 8 9
1 6
4 8
2 4 6
3 7
4 1 5 2 3
Hard #3
6 7 9
8 7 2 5
5 1 7
8 6 4 9 1
3 7 8
9
2 6 1 8 9
1 3 7 2
3
Hard #4
4 8 5
3 7 2
6 1 7 4
8 7 9
2 4 8
2 5 6
9 5 6 2 3 8
6 3 5
1
Hard #5
8 4 5
8 1
5 3 9
5 4 9 6 3
2 9
8 5 2
4 7 2 5 6 1
9 4 5 8
7
Hard #6
2 8
6
9 1 2 5
8 1 4
5 9 3
1 3 4 6 2
6 1 7
4 2 6 5
2 1 8 9
Hard #7
9 5 4
6 8 3 9
7 4 6 5
7 8
9 5 3
8 1 6
6 1 8
2 7 3
2 3 6 7
Hard #8
4 1 3
5 1
9 7 8
6 5 8
3 5 9 1 6 4
4
5 8
3 6 7
8 9 3 4 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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