Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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