Printable Hard Sudoku

Set 3p6ge7. 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
1 2 9 4
5 6 2 9
8 2 5
3 4 2 5
7 6 8 1
5 6 3
1 2 7
9 2 5 6
Hard #2
3 8 5 4
6 3 5
5 2 1 6 7
9 2 4 8 6
8
1 8 5 7
6 5
3 8 9 5
3
Hard #3
1 6 8 3
7 4 8 5 2
6 7 9
8 2 5
9 7
7 5 4
8 2
3 8 2
1 4 5 9
Hard #4
4 2 6 8 9
7 1 5
9 5 6 1
6 8 7 5 9
8 9 7
3 2
7 2 9
4
2 1 3
Hard #5
2 6 5 4
3 7 6 5
4 3
5 1 9 2
7 4 8 6
1 8 2 7
4 5 8 7
8 6
3
Hard #6
2 6 9 8 1
6 8 1
2 7 4 6
4 9
6 8
2 7 3 8 6
2 7
1 2
9 7 5 8
Hard #7
4 7 3 9
7 9 6 4
1 5 7 6
2
5 8 1
8 1 7
3 4 2 5 8
1 4 3
3 5
Hard #8
7 3 5
2 9 6 8
9 3
2 3 1
8 4 3
2 5 7
6 2 7 1 3
8 5 2
2 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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