Printable Hard Sudoku

Set 1vp2frc. 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
6 5 9 8
1 4 5 2
2 3
8 4 6 7 3
4 5 7
8 2 3 4 1
7 3
5 1 8
Hard #2
9 4 5
4 3
5 7 1 9
3 6 5 2
4 2 6
2 6 1
5 8 4
8 2 3
9 3 5 7
Hard #3
2 7 6 9 8 3
1 3 9
7 3 6 5 1 2
1 9 4 8
5 7
6 7
3 4 6
2 9 4
Hard #4
5 3 6
8 9 7
2 9 6 8
8 7 6 3
3 6
2 3 8 9 5
9 1 5
6 1 2
7 8
Hard #5
6 8 3 9
8 5 2 7
2 5
9 1 7 8
4 8 5 3 9
8 2 4
2 5 3
1 9 7
4
Hard #6
3 5 4 2
5 1 9
3 5
8 3 2 5
4 8 1 6
2 6 9 5 8
1 8 4
6 9 4
2
Hard #7
9 1 2
1 2 3 5
2 5 7 4
8 7 6 9 4
9 2
9 1
9 1 4 2
8 3 5
5 8
Hard #8
5 9 2 4 3
5 8 2
8 1 3 9
8 5
1 4 6
7 1 9
9 2 4 1
1 7
3 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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