Printable Hard Sudoku

Set 163twib. 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
2 1 6 5 4
9 3
5 9 7
4 2 3 5
9 7 4 1 8 6
2
9 1 3
1 6 8 2 4
Hard #2
8
3 9 1 7
5 8 2 4 9
5 4 1
7 6 4
2 9 8
9 2 1
4 5 1 3
7 3 2
Hard #3
4 5
1 2 3
8
9 6
4 7 9 2
1 7 8 2
2 3 9 5 7 4
5 1 4 8 9
7 3
Hard #4
4 3
7 8 5 1 3
8 5 1 6
7 8 4
2 1 6 3
9 7 3 2
4 7
7 6 2
1 4
Hard #5
1 8 9
6 8 1
3 4 7
9 7 3 4 6
2 5 7 9
6 1 9 7
1 4 7
2 5 6
2
Hard #6
4
8 7
4 5 1
5 7 6
6 2 1
3 7 9 5 6 8 2
5 4 2 8
8 3 7
1 4 7
Hard #7
6 3 7
4 3 8
2 6
7 3 4 6
4 2 1 6 3 9
8
5 9 8 1
7 4
2 6 7 1
Hard #8
6 9 1 2
9 4 1 5
8 4
7 5
8 1 2 9 7
4 5 2
7 2 1 5
8 5 3 7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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