Printable Hard Sudoku

Set u8qkej. 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
9
3 5 8
2
6 2 1 5
9 3 7 4 1
1 2 9 6 7
9 1 7
1 8 9 6
7 4 8
Hard #2
9
2 6 8
1 6 8
4 7
2 7 5 3
3 2 1
3 5 7
8 5 3 4 9 1
7 9 4 8
Hard #3
3 7 9
5 9 8 4
2 7 1 8
9 5
7 3
6 4 3
7 3 1
8 2 9 3
3 8 6 7
Hard #4
2 9
3 2 5
3 4 9
3 7 6 4 2
2 1 5 3
7 1
4 1 6 7 9
5 8 3
6 8
Hard #5
7 3 6 2
1 5 6
2 8 5 7
2 9 5
6 8 7 4
4 3 7
9 1 3
6 5 8 2
2
Hard #6
2 1 9 5
7 5 1 6
1 7 6 3 2
9 5
5 3 7
8 1
5 7
4 6 7 8
2 1 9
Hard #7
3 5 2
5 3 6 7
1 7 2
9 1
6 9 5 4 2
4 8 6 9
2 9
9 4 7 8
8 4
Hard #8
2 3 4 8
6 1 9
3 2 7 6 1
6 1 9 5 2 3
3 7
3 7
4 2 7
2 9 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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