Printable Hard Sudoku

Set n4l0or. 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
7 9
4 6
3 1 6 9 4
7 1
7 3 5 8 4
7 2 6
7 9 1 6 5 2
8 5 3
1
Hard #2
8
5 3 6 1
9 6 2 7 8 5
2 3
1 6
6 7 4
5 8 6
7 9 3 8
8 5 4 1
Hard #3
6 1 8
7 5 9 3
3 8 7 1 2
5 2
4 6 1 8
3 4
8 1 6
2 3 9 5 1
1
Hard #4
6 7 1
1 7 3 2
8
8 3 2 1 6 9 7
7 2 9 5
1
5 8 6
1 9 3 2 8
8
Hard #5
6 1
8 9 5 2
5 3 2 6
9
6 5 2 1 4
4 6 1 5
3 7 6
7 3 8
4 2 1
Hard #6
2 7
9 1 4
9 5
2
5 3 7 6 8 4
1 2 4 7
5 8
9 8 6 7 5 1
4 3 7
Hard #7
6 1
2 8 9 4
5 4 2 6
1 7 9
3 7 5
9 4 6
6 1 2 7 8
3 4 1
5 3
Hard #8
6 2 7 1
9 2 4
1 8 6
2 5 9 7
4
7 8 5 6 1
8 6 5
7 3 1
1 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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