Printable Hard Sudoku

Set 6fi8ac. 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
8 7
8 9 3 5
9 3 5 2
6 8 4
4 7 6 8
6 5
8 9 3 7
4 2
3 5 8 9
Hard #2
5 7 2 8
4
7 5 2 9 1
5 4 7 2 6
6 1 9
3 9 2 5
8
1
1 3 6 7 9
Hard #3
7 8 5
6 1 2
2 9 6
6 3 9 5
8 4 3 2
3 2 8 4
2 6 1
4 6 8
7 3
Hard #4
5 8 7
2 7 5 4
3 9 6 8
7 2 1 9
6 1 7
4 3 7 6
3 2
1 8
9 6 5
Hard #5
7 2 6 9
7 4
2 8
1 2 7
3 8
6 8 5 1
4 6 9 3
1 5
9 8 3 5 2 4
Hard #6
4 5 8 3
8 1 4 9 5
9 3
3 5 4 1 9
9
1 2 5
5 8 2
2 6 7
9 2 6
Hard #7
2 7 4 6
5 6 2 9 3
4 7
3 8 1
3 5 6
9 3
7 5 9
1
6 8 9 5 2 4
Hard #8
4 5 3 1
1 6 8 3 7
9 1 5
4 9 1 6
9 4
2 3 7
2 7 5
4 2 7
1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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