Printable Hard Sudoku

Set 10o59ij. 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
5 9 4
4 2
6 3 4 5 1 9
2
5 4
9 7 4
7 6 8
6 1 5 9 4
3 4 1 6
Hard #2
2 9 5 1 8
1 4 3
9 8
1 6 2
7 2 4
4 1 3
4 9 5 7 8 6
4 2
8 4
Hard #3
8 3 6 5
6 9 2
6 9
6 1 3
5 8 3 7
3 5 2 7
1 3
2 1 7 8
7 8 6
Hard #4
4 6 1
8 5 2
6 3 5
7 1 2 4
8 3 7
7 2
1 2 4 6
8 6 9 2
2 8 1
Hard #5
6 2 9
5 2 3 6
9 5
6 9 3 8 4 7
3 5 4
8 7 6 5
7 1
8 7 3
4 7
Hard #6
1 5 2 4
2 8 6
4 9 7 1
2 6
5 1 9
3 9 8 2
3 7 2
1 5
3 9 5 4
Hard #7
5
4 8 5
9 2 8 4 1
3
5 2 9 7
6 4 1 8
6 8 7 5
1 2 3 6
3 1 4
Hard #8
2
5 6 4 9 2
3 2 1 7 5
1 8 7 4 9
4 5 1 6
6
5 2
3 1 6
6 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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