Printable Hard Sudoku

Set xsal9u. 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
6 8 1
1 9 4 6
3 5 4
6 1 3 9
5 2 3
6 7
8 1 9 5 6
3 1
3 2 7
Hard #2
3 7 8
5 3 1 4
4 8 2
8 2 3
9 7 4 5 8
1 7 9
4
4 8 1 6
5 7 3
Hard #3
6 3 2 4 5 9
9 8 7 1
7 1 9
2 4 6 8
2 5
3 4 7
6 1 5 3
2 1 9
Hard #4
8 1
7 1 3 6
4 2 3 1 7
4 8 1 7
6 4 2
7 6 8
7 3 5 2
5 9 7 1
Hard #5
6 3 1 2 8 9
2 3 7
8
4 6
2 7 9 4 3
2 5 8 7
5 9 7
7
8 7 2 3
Hard #6
6 7 2 3 4
9 1
6 1 7 3
6 8
1 4
3 7 2
5 6 4
3 4 9 7 8
8 1 9
Hard #7
1 5 6
9 4 8 7
9 7 1
4
3 6 2
7 6 2 4 9
1 8 3 4 6 5
4
8 5 1
Hard #8
4 7 1 6
2 3 7 4
8 6 3 1 7
5 2
2 3 9 1 4 5
3 9
9
6 3
5 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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