Printable Hard Sudoku

Set 5bn3lx. 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 7 5 1 4
1 4 9 3
3 2
5 7 3 8
9 7
9 1 8 5 7 3
6 4 1
9 5 6
Hard #2
5 7 1 8 3 6
9 2 1
6 7 9
5 6 3
2 8 6 4 1
7
1 6 4 8 5
5 9 6
Hard #3
2 3 9 6
6 5 1 9
2 1 5 8
4 2
5 6 4 3
4 1 3 7
3 7 2 9 1
6 5
Hard #4
7 6 5
3 5 8
6 9 2 3
2 5 7 6
6 5 8 7
1 4 2
1 9 5
4 5 6 1
7
Hard #5
2 9 3
5 2 6
8 1 5
6 8 5 4 3
6 9
9 1 2
3 2 1 7 5
1 6 4 8 5
Hard #6
4 2 6
2 3 1
8 6
5 3 7 9
8 6 4
9 2 5
9 2 8 4 3
4 5 1 2 8
8
Hard #7
6 8 3 7
9 7 4
3 6
5 8 2 4 1
6 5 8 2
1 3 7
2 6
5
4 5 9 1 3
Hard #8
5 4 1 2
6 1 7 5
3 8 6
3 7
5 4 7 6
9
7 9 6 3 4 8
7 5
2 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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