Printable Hard Sudoku

Set 6r51ac. 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
5 4
6 2 1 8
7 3
8 5 9 7
6 3 4
3 5 1 2
4 8 5 2 1
8
9 2 6 3
Hard #2
6 1 8 2 5
5 3 6 4 8
8 7
4 8 7 6
6 2 8
1 2
4 6 8 5
4
5 6 2
Hard #3
6 9 8 1
8 7 9 3
1 5 2
8 5 2
9 2 7 4 8
3
4 5
1 6 3 7 8
5 3
Hard #4
3 4 9 6
8
5 2 6 3 9
5 7 6 1
4 8 3 7
7 2 5 4
4 9 5
9 1
7 3
Hard #5
1 8 9 3
8 1
9 4 5
2 3 7 6
1 7 3 5
7 4 6 2
5 4
6 1
9 7 2 6
Hard #6
3
1 9
6 2
8 7 5 3
1 4 7
2 3 8 9 4
7 8 3 6
9 5 7 4
4 8 2 1
Hard #7
4 7 6 1 9
8 9 3 6
3
2 4 1
7 3 2
5 6 4 1
5 3 2
8 6 1 5
8 1
Hard #8
3 9 6
7 1 8 5
2 5 3 8 6 9
3 6 5 7
4 1 8 3 5
9 4 3
5
7
6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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