Printable Hard Sudoku

Set 1mb6eyj. 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
5 8 3
3 7 5 9
2 6
2 7 4
4 6 2 3
7 5
2 6
8 3
7 9 3 4 2 8 5
Hard #2
9 3 2 5
7
1 9 7
8 6 4
4 7 9 1 3
4 3 6
7 8 5 3 4
5 6 1
2 1
Hard #3
8 4 6 2
5 1 8 7
2 3
9 8 4
6 4 9 5
5 1 2
5 3
6 7 1 2
1 3 4
Hard #4
8 9 1 3 2
1 4 8 7 5
2
6 1 5 4 8
7 9 6
2
5 3 1
7
5 8 1 6 9
Hard #5
6
6 3 4 9
7 6
4
9 6 5
7 2 5 8 4
7 3 1 9 2
5 4 7 2 9
7 3 1
Hard #6
5 9 8
9 3
1 3
9 2 1
8 5 3 6 7
7 4
2 4 6 1
8 1 2 5 3 4
7 8
Hard #7
1 7 8 6
9 8 4 3
5
7 8 3 4
1 9 7
3 5 9
3 7 1 8
4 6 9 2 7
2
Hard #8
9 1 5
7 3 8 9 1
4 9 1
9 1 6 3
8 2 7
2 3 9 4
5 8
5 3
4 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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