Printable Hard Sudoku

Set bt0klw. 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
1 8 2
6 3
7 5 2 1 4
7 9 1 6
3 4 1
7 9 8 2
6 4 3 7
8
6 3 4
Hard #2
4 6 3 9 1
2 7 5
7 9
2 6 8
1 8 9 5
5 3
8 1
4 6 2 7
9 1 5 4
Hard #3
4 5 9
6 2 5
8 4 6 2
7 6 4
8 2 3 7 5
6 3 1
9 3 8
3 2
8 1 3
Hard #4
9 1 8
2 5 1 7
2
8 9 4 5
9 5 6 7
7 5 6
3 6 9 5
7 9 8 3 4
2
Hard #5
4 5 6
6 3 9
2 4
4 5 8 7 9
4 2 1
5 2 4 8
7 6
7 3 1
2 3 9 7
Hard #6
8 2 5 6
9 1 7 2
5
2 8 7 4 3
6 8 1
7 6 8
7 2 1
4 3
1 8 9 7
Hard #7
5 4 1
8 6 2
4 7 3
9 4 5 7
6 3 4 8
4
4 3 6 2
5 9 1 4
2 7 9
Hard #8
4 6 1
2 7 8 5
8 3 7
5 2 6 4 8
4 5 7 6
9 1
6 1 9 4
9 3
5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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