Printable Hard Sudoku

Set 11ifxxd. 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
8 7 9
2 4 3
2 7 8 9 3 6 4
1 2 5
6 7 5 2
8 2 5 6
3 7
6 1
Hard #2
1 4 8
6 7 4
8 9 7 5 1
9 7 3 4 2
5 9
2 9
2 8 6 3 7
9
4 2 5
Hard #3
3 7 9
8 3 6 4
1 5 9
7 1 6 4 8
4 2
9 5
1 8 6
7 4 6 3
2 5 7
Hard #4
1 4 2
1 8 9 6
3 5
1 7 4 2
8 6 7
3 9
4 6 3 5 9
8 5 6
2 1 7
Hard #5
4 5
8 3 9 4
6 1 2
2 1
8 5 4
1 2 3
5 6 1 4
7 9 3 8
1 4 8 6
Hard #6
3 7 6 9
4 1
6 5 4 7 2
2 6
3 4 8
4 7 9 3
9 6 5 7
8 2 5
7 9
Hard #7
7 5 1 3
5 9 6 7 4
2 4
7 6
4 7 1
4 5
4 8 3 5 9
9 4 2
9 7 6
Hard #8
6 1
2 1 9 4 8
2 7
5 9 8
4 2 5
7 2 3 9 1
3 4 7
4 5
6 3 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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