Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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