Printable Hard Sudoku

Set 1uygn9j. 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 2 6 3 5 4
5 7 3 2
8 6
7 5 9 6 1
6 5
7
4 1 8 3
6 4
1 3 9
Hard #2
7 5
9 3 7 1 5
1
2 1 4
5 3 6
2 9 8 1
4 7 9
6 2 4
9 3 2 5 7
Hard #3
7 4 3 9 8
2 9 7
9 5 1
8 2
3 1
1 5 4 8 6
6 1 8 3 5
5 8 9 7
Hard #4
2 4 8
6 5 8 3 7
4 5 2 7 9
4 3
3 4 6
9 1
6 8 1
6 7 9
9 4 2
Hard #5
4 5
6 4 3
7 2 9 8 4
6 9 2 4
3 9 8
1 4 7
1 2
3 7 2 6
4 7 9
Hard #6
4 9 2 1 6
1 4
8 7 6
6 5
1 2 3 8
6 5 7
7 8
6 2 5 9 3 1
8 6
Hard #7
8 1 5 4
4 2
6 9 5
3 4 7 9
9 2 4
1 7
6 2 9 4 3
6 3 1 5
1 4
Hard #8
6 2 3
8 1 2
7 6 4 9
4
4 6
6 9 7
2 6 7 8 5 1 4
4 1
5 1 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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