Printable Hard Sudoku

Set 1ghty7. 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 8
9 7 3
8 1 3 9 7
9 5 8 1 3
2 8 9
7 4
7 5 1
8 5
3 5 9
Hard #2
5
4 2 9 6
7 6 4 1 8
8 2
5 8 4
1 9 7
4 8 6
4 9 7 5
3 6 1 5
Hard #3
8 5
8 9 2
7
2 5
6 7 1
8 5 1 4 7
1 7 4
7 4 2 8
4 2 5 8 9 6
Hard #4
9 5
7 8 3 5 6
1 4 2 8
1 9 3 7
8 4
2 1 7 8 9
4 7
5 2
7 3 5
Hard #5
3 6 4 5 9
6 9 7 3
4 1 8 7
6 1 7 9
1 6
7 2 6
8 9
7 2
5 6 8
Hard #6
9
9 1 8 6
2 1 3 5 4
5 3
3 8 7 6 9 4
4 6 5
7 5 4
1 7 3 6
1
Hard #7
9 7
8
3 7 8 5
6 9 8
3 1 5 2 7
7 8 3 1
2 1 8 6 3
4 9 2 6
7
Hard #8
9 4 8 1
2
5 4 9
8 7 4
4 9 3 7
2 9 1
2 7 5 3 6 9
1 6
1 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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