Printable Hard Sudoku

Set 19o0m2y. 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
8 1
2 9 7
1 5 9 7
6 3
7 1 4
9 3 8 1 2 7
4 3 8
3 5 6 9
2 5
Hard #2
1
6 1 9 8
4 6 3
3 8 6 4
1 9
1 5 9 2
5 9 8
8 3 9
4 7 3 8 2
Hard #3
6 9
8 3 6
7 9 2
6 5 4
4 1 6 3
5 2 8 1
9 1 8 4
4 1
7 2 4 9
Hard #4
4 9 7 5
7 4 2
6 1
3 5
1 8 9
6 7 3 1
4 8
2 1 3 4 8 6
7 2 9
Hard #5
6 2
7 5
5 1 9 7
4 3 8 7 9
3
1 2 6 8
6 1 2
7 9 5 8
4 3 9 6
Hard #6
4 5 8
7 6 3 9
2 6 7
8
5 2 7 1
1 3 5
9 1
7 2 8 4 5
9 1 8 4
Hard #7
2 1 6 9
8 7 1
9 2 5
2 4 1 3
5 3 9
7 1
4 8 5
9 8 3 5 4
5 7
Hard #8
2 6 4 1
7 1 4
4 5 7
6 1 3
3 7 9 5 6
9 4 8
5 3
8 6 1 5
5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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