Printable Hard Sudoku

Set zpgd1g. 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 4 8 1 2
3
9
2 7 3
1 3 4
1 6 8 5 7
8 4 7
9 8 1 3
6 5 8 1
Hard #2
5 6 1 4
2 1 8
5
1 2 7 9 3
8 5 6
9 1 4
9 3
5 8 4 6 2
9 7 5
Hard #3
1 8 9 4
3 8
7 3 9 5 1
1 5 7
3 8 1
6 9
6 1
7 2 1 3 8
4 5 6
Hard #4
6 1 3 9
4 2 8 3
3 5 1
6 7 8 2 5
5 6 7
2 3
4 3 9 6
1 5 2
8
Hard #5
8
5 3 2 7 9
9 8 5 6 2 4
3 7 2 5
7 4
1
1 4
3 9 1 5 2
8 6 9
Hard #6
7 4 5 9
3 9 6 4
1 4 2
8 9
4 7
8 5 6 4
5 8 1 2
6 4 5 9
7 8
Hard #7
7 4 1
3 4 7
2 3 6 5
2 8 4
8 5 3 7 6
5 4
4 9 8 6
8 9 2
5 6
Hard #8
5 2 9 1
3 6
9 3 8
4 9 7 3
2 1
2 6 4
7 4 2 8
6 5 2
8 2 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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