Printable Hard Sudoku

Set 16it0kh. 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
4 3 2 6
8 7
2 4 1 8
6 1 8
5
7 3 2 4 9 8
2 3
1 4 8
4 1 7 6
Hard #2
2 5 3
6
8 5 6 9
8 5 4 9 2
2 3
1 8 6 5 2
6 5 1 8
8 7 1
7 3
Hard #3
6 5
5 3 4 8 1
6 5 8
9 5 2
3 5 1 4
7 6 9
7 1 5 9
2 4
9 2 7
Hard #4
8 9 3 6
6 3 1 5
5 2 9 6 8
6 4 7 2
9 8 3
8
1 7 9 4
4 2 1
6
Hard #5
9 3 2
2 4 6 5
1 7
1 2 3 4
6 7
8 5 4 6 1
6 5 2
7 6 8 3
9 1
Hard #6
7 9 6
3 1
4 5 3 2 7
7 4
5 6 9
3 2 9 7 1
5
9 8 3 4
6 9 1 7
Hard #7
5 2 7 3
3 8 1 7
8 9
8 1 3 9 5
1 9 6 4
8
5 7
3 9
8 4 2 3 7
Hard #8
3 7 8
7 3 1 5
8 7
3 7 6 5 4 9
8 2 6
4 6 1
1 9 3 8
5 2
7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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