Printable Hard Sudoku

Set 12innx2. 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 8 3
8 2
3 1 7 6 5
2 9 1 4
9 3
4 5 8 9
6 1 5 7
4 1 2
4 3
Hard #2
3 9 8 2 7
4 9 5
8 5 3 1
2 7
1 4 3
7 5 1 8
1 3 7 5
9
2 6 7
Hard #3
3 2 5 4
7 1
2 9 8
8 5 1 2
1 2 9 5
4 5 6
6 1 8 9 7
7 3
9 6
Hard #4
4 7 2
5
6 8 2 5 4
1
2 5 6 7
7 4 1 9 3
7 3
4 8 9 1
1 5 7 9
Hard #5
8 2 6
2 4 7
7 8 1
9 6 5 4
4 2
8 6 4 7
9 6 8
2 3 5
1 8 4 9
Hard #6
3 4
1 9 7
7 3 8
5 1 8 2 3
6 4 8 9
4 7 9 1
6 3 8
1 7
7 2 1
Hard #7
9 1 8 2
7 3
3 6 7 9 8 4
9 7 5 2
1 9 6 8
1 5
5 7
8 2 3
2 8
Hard #8
6 1
5 2 4 8
8 3 9 5 6
9 6
4 7 5
4 7 2 9 8
1 9 7
5 6 4
2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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